JR
IL
15-055
The Federal Democratic Republic of Ethiopia
Geological Survey of Ethiopia (GSE)
THE PROJECTFOR FORMULATING MASTER PLAN
ON DEVELOPMENT OF GEOTHERMALENERGY IN ETHIOPIA
FINAL REPORT
APRIL 2015
JAPAN INTERNATIONAL COOPERATION AGENCY (JICA)
NIPPON KOEI CO., LTD.JMC GEOTHERMAL ENGINEERING CO., LTD.
SUMIKO RESOURCES ENGINEERING ANDDEVELOPMENT CO., LTD.
JR
IL
15-055
The Federal Democratic Republic of Ethiopia
Geological Survey of Ethiopia (GSE)
THE PROJECTFOR FORMULATING MASTER PLAN
ON DEVELOPMENT OF GEOTHERMALENERGY IN ETHIOPIA
FINAL REPORT
APRIL 2015
JAPAN INTERNATIONAL COOPERATION AGENCY (JICA)
NIPPON KOEI CO., LTD.JMC GEOTHERMAL ENGINEERING CO., LTD.
SUMIKO RESOURCES ENGINEERING ANDDEVELOPMENT CO., LTD.
Ethiopia
Location Map
Great Rift Valley
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3
4 5 6
7 8
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10
11 12
13 14
16
17
18
19
20 15
21 22
Source: Google Earth Pro
The Project for Formulating Master Plan on Development of Geothermal Energy in Ethiopia
Executive Summary Final Report
THE PROJECT FOR FORMULATING MASTER PLAN N DEVELOPMENT OF GEOTHERMAL ENERGY IN ETHIOPIA
EXECUTIVE SUMMARY
1. BACKGROUND AND PURPOSE OF THE PROJECT
1.1 Background The total installed capacity of electricity power plants in Ethiopia amounted to 2,100 MWe, as of
January 2010; more than 90% are of hydropower. Under such circumstances, the Ethiopia electric
sector addresses the development of indigenous energy such as geothermal and/or wind power, with
recognition of the importance of energy diversity and energy mixture.
Among other indigenous types of energy, geothermal energy has become more important as a base
load power. Geothermal potential survey was commenced in Ethiopia in 1969. Since then,
step-by-step potential surveys have identified more than 16 promising geothermal sites for electricity
development. However, development stages vary from site to site, only two sites, i.e., Aluto Landano
site and Corbetti site, are being developed towards commercial operation.
The Geological Survey of Ethiopia (GSE) requested the Government of Japan for technical
assistance in formulating a master plan for geothermal development including technical capacity
building for geothermal development. In response to the request, the Japan International Cooperation
Agency (hereinafter referred to as “JICA”) dispatched the JICA Project Team to Ethiopia for the
implementation of “The Project for Formulating Master Plan on Development of Geothermal Energy
in Ethiopia” (hereunder referred to as “the Project”).
1.2 Objectives and Scope of Work of the Project
1.2.1 Objectives The objectives of the Project are as follows:
1) To conduct geothermal surface survey;
2) To prioritize geothermal prospects with a unique set of criteria;
3) To formulate the master plan for geothermal development based on the above; and
4) To contribute to capacity development of GSE under the process of formulating the master
plan.
1.2.2 Counterpart and Relevant Organizations The counterpart organization and the Joint Coordination Committee are as follows:
1) Counterpart:
Geological Survey of Ethiopia (GSE), Ministry of Mines of Ethiopia
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2) Joint Coordination Committee (JCC)
i) Ethiopian Organizations
Director General of GSE / Chief Geologist of GSE
Director of Geothermal Resource Directorate, GSE
Representative from the Ministry of Mines (MoM)
Representative from the Ministry of Water, Irrigation and Energy (MoWIE)
Representative from the Ethiopian Electric Power (EEP)
Representative from the Ministry of Finance and Economic Development (MoFED)
ii) Japanese Organizations
Resident Representative of JICA Ethiopia Office
JICA Project Team
Other personnel concerned to be proposed by JICA
iii) Observer
Representative from the Embassy of Japan
Note that EEPCo was restructured in December 2013 into two companies: a) Ethiopia Electric
Power (EEP) responsible for power generation and transmission, and b) Ethiopian Electric Utility
(EEU) for delivering electricity services (distribution, and sale of electric power). The EEP will be
managed by the Ethiopian CEO, whereas the EEU will be managed for two years by an Indian
company (Power Grid Corporation).
1.2.3 Target Sites The target sites are listed in Table 1.1 below. The approximate locations are shown in the location
map at the beginning of this report.
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Table 1.1 Target Sites
Geothermal Sites Prioritization /
Data base Remote Sensing
Site Survey
1 Dallol ☑ ☑ GSE 2 Tendaho-3 (Tendaho-Allalobeda) ☑ ☑ ☑ 3 Boina ☑ ☑ GSE 4 Damali ☑ ☑ GSE 5 Teo ☑ ☑ GSE 6 Danab ☑ ☑ GSE 7 Meteka ☑ ☑ ☑ 8 Arabi ☑ ☑ GSE 9 Dofan ☑ ☑ ☑ 10 Kone ☑ ☑ ☑ 11 Nazareth ☑ ☑ ☑ 12 Gedemsa ☑ ☑ ☑ 13 Tulu Moye ☑ ☑ - 14 Aluto-2 (Aluto-Finkilo) ☑ ☑ ☑ 15 Aluto-3(Aluto-Bobesa) ☑ ☑ ☑ 16 Abaya ☑ ☑ - (17) Fantale ☑ ☑ - (18) Boseti ☑ ☑ ☑ (19) Corbetti ☑ ☑ - (20) Aluto-1 (Aluto-Langano) ☑ ☑ - (21) Tendaho-1 (Tendaho-Dubti) ☑ ☑ - (22) Tendaho-2 (Tendaho-Ayrobera) ☑ ☑ ☑
(Source: JICA Project Team)
☑:Target for the M/P formulation project GSE: The sites where GSE should undertake the site survey due to access and/or security issues. Source: Proposed by the JICA Project Team based on the R/D (11 June 2013) and subsequent discussions between GSE and the JICA Project Team
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2. ELECTRICITY DEVELOPMENT PLAN
2.1 Growth and Transformation Plan The latest government development plan is the Five-year Growth and Transformation Plan (GTP) for
the period 2010/11-2014/15. The strategic directions of the energy sector are development of
renewable energy, expansion of energy infrastructure, and creation of an institutional capacity that
can effectively and efficiently manage such energy sources and infrastructure. The main objective of
the energy sector is to meet the demand for energy in the country by providing sufficient and reliable
power supply that meets international standards at all time. The main targets of the energy sector are
summarized in Table 2.1.
Table 2.1 GTP Targets of the Energy Sector Description of Target 2009/10 2014/15
1. Hydroelectric power generating capacity (MW) 2,000 10,000
2. Total length of distribution lines (Km) 126,038 258,000
3. Total length of rehabilitated distribution lines (Km) 450 8,130
4. Reduce power wastage (%) 11.5 5.6
5. Number of consumers with access to electricity 2,000,000 4,000,000
6. Coverage of electricity services (%) 41 75
7. Total underground power distribution system (Km) 97 150
Source: GTP (2010/11-2014/15)
2.2 Overview of Power Sector
2.2.1 Policy, Laws, Regulations, and Strategy The Plan for Accelerated and Sustained Development to End Poverty (PASDEP) was presented as a
five-year (2005/06-2009/10) development strategy in 2006. Following PASDEP, the GTP mentioned
the current national policy for the period 2010/11 – 2014/15 and has targets to increase the installed
capacity by 8,000 MW of renewable energy resources. Table 2.2 presents the targets of PASDEP and
GTP.
Table 2.2 Targets in the PASDEP/GTP Period 2005-2015
Item 2005/06 PASDEP
2005/06-2009/10 2012
GTP 2010/11-2014/15
Installed Capacity 791MW 2,218 MW (+1,427MW) 2,168 MW 10,000 MW Electrification Rate 16% 50% (+34%) 17% 75% Length of Transmission/Distribution Line
- 13,054km 12,461 km 258,000 km
Electricity Loss 19.5% 13.5% - 5.6%
Source: PASDEP/GTP (summarized by the JICA Project Team)
The Ethiopian Electric Power Corporation (EEPCo), former the national electricity utility in charge
of power generation plan, completed the “Ethiopian Power System Expansion Master Plan” for the
next 25 years (2013–2037) in February 2014.
2.2.2 Power Sector Institutions There are five major institutions engaging in the power sector, namely: (i) Ministry of Mines (MoM),
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(ii) Geological Survey of Ethiopia (GSE), (iii) Ministry of Water, Irrigation and Energy (MoWIE),
(iv) Ethiopian Electric Power (EEP) and Ethiopian Power Utility (EEU), and (v) Independent Power
Producers (IPPs). The MoM and MoWIE undertake policy- and regulation-making; while GSE
conducts geothermal exploration, and EEP, EEU, and IPPs undertake construction and operation of
power supply system (generation, transmission and distribution).
2.2.3 Power Demand Forecast The Ethiopian Power System Expansion Master Plan (2014) forecasted that the energy demand
would grow from 1,445 GWh of 2013 to 146,691 GWh in 2037 as shown in Figure 2.1; Energy
export sales are forecast to grow from 1,445 GWh in 2013 to 35,303 GWh by 2037, and the total
demands (MW) of exports are forecast to grow from 140 MW in 2012 to 4,080 MW by 2037.
*Actual record in 2012
Source: Ethiopian Power System Expansion Master Plan, EEPCo, arranged by JICA Project Team
Figure 2.1 Energy Requirement Forecast including Exports (2012-2037)
2.2.4 Power Generation Planning Table 2.3 shows the existing electricity development plan indicated in the EEPCo master plan,
except geothermal power plant.
Ethiopia is blessed with high hydropower potential. In the last five years (2009 – 2013), a total of
1,200 MW of hydropower plants at four sites were put into operation which has made the installed
capacity as triple as the before. The government of Ethiopia intends to continue to develop its
hydro-potential as shown in the Table 2.3.
17,447
45,960
77,343
110,698
135,386146,691
21,490
56,932
97,294
149,902
196,419
221,594
6,90614,393
34,76048,848
68,74279,296 84,803
0
50,000
100,000
150,000
200,000
250,000
2012
*
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
Reference High LowGWh
Year
Power Generation
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Table 2.3 Existing Electricity Development Plan (except geothermal)
Power Plant Status Installed Capacity
(MW) Power Generation
(GWh)
Hydropower Under Construction 8,124 21,826 Candidate 12,407 59,279
Wind Farm Committed 153 424 Candidate 1500 4,765
Solar Candidate 300 526 Biomass Candidate 120 578 Energy from Waste Committed 25 186 Sugar Factory Candidate 474 2,283 Gas Turbine Candidate 280 2208 CCGT Candidate 420 3219 Diesel Candidate 70 515
Source: EEPCo 2014, summarized by the Project Team
2.2.5 Transmission Planning Transmission expansion plan was developed in the EEPCo master plan study based on the demand
forecast and generation plan mentioned above. The transmission expansion plan was considered to
connect the candidate power plants meeting the electrical demand forecast in two stages, i.e.,
short-term from 2013 to 2020 and long-term from 2021 to 2037. This development plan includes the
generation plan of committed geothermal project including Aluto-Langano and Corbetti. Most of the
other geothermal prospects in this project are located along the existing and planned networks which
also run along the Great Rift Valley.
2.2.6 Financing and Tariff Table 2.4 shows the published consumer tariffs in Ethiopia for 50 years from 1959 to 2003. The
domestic tariff is reduced to around ETB 0.47/kWh (equivalent to around USD 0.03/kWh) with a
large amount of subsidies, so that the poverty group can have access to electricity.
Table 2.4 Consumer Tariffs
LV: Low Voltage、HV: High Voltage
Source: Ethiopian Power System Expansion Master Plan, EEPCo, arranged by the JICA Project Team
2.3 Geothermal Power Development
2.3.1 Committed Geothermal Power Development Plans In this master plan study, considering the latest information on donor involvements and GSE plan,
existing and committed geothermal sites are ranked in priority order of development. Table 2.5
summarizes the committed geothermal prospects.
1952-1964 1988-1989 1990 1991-1998 1999-2003EEPCo ICS SCS EEPCo ICS SCS EEPCo ICS SCS EEPCo EEPCo EEPCo EEPCo EEPCo
1 House Hold 0.1250 0.1250 0.1250 0.1250 0.1425 0.1513 0.1468 0.1425 0.1513 0.1468 0.1772 0.2809 0.3897 0.47352 Commercial 0.0750 0.1250 0.1650 0.1436 0.1525 0.1975 0.1735 0.3436 0.4146 0.3774 0.3653 0.4301 0.5511 0.67233 Street Light 0.1100 0.1500 0.1285 0.1100 0.1500 0.1285 0.3322 0.4146 0.3711 0.3333 0.3087 0.3970 0.48434 Small Industry 0.1333 0.1733 0.1520 0.1333 0.1733 0.1520 0.2232 0.4597 0.32035 LV 0.0475 0.0875 0.0645 0.0625 0.1175 0.0857 0.2232 0.4397 0.3133 0.2563 0.3690 0.4736 0.57786 HV 15kV 0.0288 0.0780 0.0474 0.0588 0.0588 0.2029 0.2029 0.2341 0.2597 0.3349 0.40867 HV 132kV 0.2416 0.3119 0.3805
Total Flat Rate 0.0968 0.0824 0.1241 0.1011 0.1027 0.1556 0.1165 0.2341 0.3500 0.2735 0.2645 0.3086 0.4020 0.4900
1965-1971 1972-1978 1979-1987DescriptionHistorical Flat Tariff Rate (Birr/kWh) EFY
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Table 2.5 Committed and Planned Geothermal Prospects MP
S No. Site
Planned Capacity and COD
Status of Commitment
2 Tendaho-3 (Allalobeda)
25 MW 2017 ICEIDA/NDF assists surface survey including MT survey.
19 Corbetti
20 MW 80 MW
200 MW 200 MW
2015 2016 2017 2018
Reykjavík Geothermal (RG)’s PPA: maximum of 1,000 MW in the next 8-10 years. Using GRMF fund, GSE is conducting a study.
20 Aluto-1(Aluto-Langano) 75 MW 2018 The Government of Japan and World Bank has assisted in drilling of wells.
21 Tendaho-1(Dubti) 10 MW 2018 AFD assists in well drilling for 10 MW. Total 610 MW
MP S.No.: Site numbering in this MP study, AFD: French Development Agency
Source: JICA Project Team
2.3.2 Existing Geothermal Development Plans In the EEPCo master plan, all candidate geothermal power plants are sized in multiples of 100 MW
capacities for simplicity without considering the site specific potential and installation plans based
on forecast demand.
Source: Ethiopian Power System Expansion Master Plan, EEPCo
Figure 2.1 Installed Capacity and Reserve Margin
2.3.3 Superiority of Geothermal Power Generation Geothermal power generation will be of the most important energy together with the hydropower in
Ethiopia, from the following reasons.
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Energy Security
Energy Mix
Reliable Electrical Supply
Greenhouse Gas Mitigation
Source: JICA Project Team, based on demand curve provided by EEP
Figure 2.2 Schematic Image of Electrical Supply Composition against Electricity Demand in
a day
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3. GEOTHERMAL POTENTIAL SURVEY
3.1 Collection of Existing Information
3.1.1 Objective
All the available existing geological papers, articles, and reports were collected for each geothermal
site as the background information for this Project.
3.1.2 Regional Survey Reports
Basic and comprehensive geological investigations were carried out from the early 70s to 80s.
Comprehensive investigations and researches were conducted by the United Nations Development
Programme (UNDP) in 1973, the Ministry of Mines in 1984, and Electroconsul/Geothermica in 1987;
thereby, most of the prospective geothermal areas were determined. As a result, those investigations
summarized that Aluto and Tendaho sites have the highest potential of all the prospective geothermal
sites in Ethiopia.
3.1.3 Detailed Geothermal Survey
Detailed surveys have been conducted since the 1980s at most of the sites. The status of surveys at
each site is shown in Table 3.1.
Table 3.1 Status of Detailed Survey at Each Site
No. Geothermal Sites Geological Survey
Geochemical Survey
Geophysical Prospecting
Other Surveys
1 Dallol ☑ ☑ - 2 Tendaho-3 (Tendaho-Allalobeda) ☑ ☑ ☑ 3 Boina ☑ ☑ - 4 Damali (Lake Abbe) ☑ ☑ - 5 Teo ☑ ☑ - 6 Danab ☑ ☑ - 7 Meteka ☑ ☑ - 8 Arabi - ☑ - 9 Dofan ☑ ☑ -* 10 Kone ☑ - - 11 Nazreth (Boku-Sodole) ☑ ☑ ☑ 12 Gedemsa ☑ ☑ -* TG well 13 Tulu Moye ☑ - - 14 Aluto-2 (Aluto-Finkilo) ☑ ☑ -* TG well 15 Aluto-3 (Aluto-Bobesa) ☑ ☑ -* 16 Abaya ☑ ☑ - 17 Fantale ☑ ☑ - Magnetic Survey 18 Boseti ☑ ☑ - 19 Corbetti ☑ ☑ ☑ 20 Aluto-1 (Aluto-Langano) ☑ ☑ ☑ 21 Tendaho-1 (Tendaho-Dubti) ☑ ☑ ☑ 22 Tendaho-2 (Tendaho-Ayrobera) ☑ ☑ ☑ Radon Survey
☑: done, - : not done, -*: to be done, TG Well: Thermal Gradient well Note: The sites having limited data, are also classified as “done”.
Source: JICA Project Team
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It was confirmed that at least the geological survey and geochemical survey were conducted at each
site. However, the quality and quantity of the results are not unified, e.g., entire site was not covered,
location of geological manifestations was not shown, or location of sampling was not shown.
3.1.4 Feasibility Study
Feasibility (or pre-feasibility) study was conducted at Tendaho-1 (Tendaho-Dubti), Tendaho-2
(Tendaho-Ayrobera), and Aluto-1 (Aluto-Langano) geothermal sites. In 1986,
Electroconsul/Geothermica conducted geothermal reservoir evaluation, design of facilities, and
economical evaluation, by drilling nine wells at Aluto-Langano. In 1996, the Ethiopian Institute of
Geological Survey (former GSE)/Aquater conducted geothermal reservoir evaluation by drilling
three wells at Tendaho-1 (Tendaho-Dubti) and Tendaho-2 (Tendaho-Ayrobera). Afterward, GSE
continued the drilling of three wells by themselves from 1995 to 1998.
3.1.5 Geothermal Plant Construction /Operation and Maintenance
The first geothermal power plant was constructed at Aluto-1 (Aluto-Langano) in 1992, based on the
above feasibility study. Reports were issued for operation and maintenance of geothermal wells after
the power plant construction.
3.2 Satellite Data Analysis
3.2.1 Objectives
Prior to the field survey, alteration zoning, mineral and lithological mapping, topographic
interpretation, and geological structure analysis were carried out using satellite images. Field survey
was conducted based on the results of the satellite data analysis and review of existing reports.
3.2.2 Methodology
Japanese satellite products, ASTER L3A and PALSAR L1.5, were used.
In ASTER data analysis, the band composite image and the band ratio image are created by using
Short Wavelength Infrared (SWIR) bands; thereby distributions of various alteration zones were
detected, rock facies and mineral mapping and interpretation of geological structures were conducted.
In PALSAR data analysis, the mosaic image of geothermal development sites was created; thereby
such geological structures as lineaments/faults, craters, caldera, lava domes and/or lava flows were
identified.
The integrated analysis on GIS was conducted with the results of ASTER DEM data compiled
together with the results of the ASTER and PALSAR data analysis. As the result, the outcrop
distributions of altered rocks were extracted and geological structures were interpreted.
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3.2.3 Results
The results of each site are as follows.
All 22 target sites are located in the East African Great Rift Valley,
In all targets sites, a number of major lineaments/faults running parallel to the direction of the
rift valley were identified,
Geothermal sites are in general classified into (1) Volcanic body, (2) Caldera form, and (3)
Graben; distribution of those are more or less parallel to the direction of the rift valley,
Hydrothermal alterations were identified in areas of volcanic bodies and calderas. Intensity
of such alteration varies from site to site; whereas particular alterations were not identified in
Graben areas possibly due to coverage with unconsolidated new sedimentary deposits.
Information obtained from the satellite image analysis was used not only in field to determine the
targets sites to be visited, but also to classify the targets area for reservoir volume estimations.
3.3 Results of the Field Survey and Laboratory Analysis 3.3.1 Geological Survey
(1) Objectives
This site reconnaissance was conducted for the following purposes:
Confirmation of geology (Topography, rocks, structures, and alteration zones: supplemental
survey for existing site survey result);
Confirmation of alteration zones which were determined by remote sensing; and
Collection of samples for rocks and alteration minerals.
(2) Methodology
Site Survey
The site reconnaissance was conducted in two stages. Exact survey points were selected based
on the existing data, remote sensing data, and interview results from local residents. The Dallol
and Arabi areas were investigated by GSE experts only.
Geological Analysis
The samples collected during site reconnaissance were analyzed by x-ray fluorescence (XRF)
for determining rock composition and by X-ray diffraction (XRD) for determining alteration
minerals.
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Table 3.2 Methodology of Geological Analysis Type of Samples Analysis Method Objective
Rock Samples XRF Composition of Rock (%) (SiO2, Al2O3, CaO, MgO, Na2O, K2O, Cr2O3, TiO2, MnO, P2O5, SrO, BaO)
Alteration Minerals
Zeolite and Others
XRD (powder specimen) Determination of alteration mineral
Clay Minerals XRD (oriented specimen)
Determination of clay mineral
- Treated by Ethylene Glycol
- Treated by HCl
Identification of clay minerals (Chlorite- Kaolinite, Chlorite- Smectite)
Source: JICA Project Team
(3) Results
The results of the geological survey are as follows:
1) Site Survey Results
The results of the site reconnaissance were summarized in the following categories.
i) Topography and route map ii) General geology iii) Geological structure, fault, and others
iv) Geothermal manifestation v) Alteration vi) Photos and others
In addition, the sites were grouped in accordance to geological and geo-morphological
characteristics based on the field reconnaissance and the remote sensing analysis as shown in Table
3.3. The results were used for reservoir resource assessment.
Table 3.3 Geological, Geo-morphological Classifications of the Target Area Classification Volcanic body Caldera Graben Target Sites Dallol
Boina Damali Dofan Tulu Moye Aluto Abaya Fantale Boseti
Gedemsa Kone Nazareth Corbetti
Tendaho-Allalobeda Tendaho-Ayrobeda Tendaho-Dubti Teo, Danab Meteka Arabi Butajira
Source: JICA Project Team
2) Results of Laboratory Analysis (XRF and XRD)
The results of the geological laboratory analysis (XRF and XRD) are shown in Table 3.4. The results
are as follows:
3) Result of XRF Analysis for Rock Composition
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SiO2-K2O+Na2O Diagram (TAS Diagram)
Figure 3.1 shows the results of analysis for the project with the results of existing reports
(Electroconsult/Geotermica, 1987; UNDP, 1973).
The results are as follows:
The analyzed data were in good agreement with the data in existing reports, classified as
alkali rock series.
The compositions of trachyte and rhyolite are similar to that of Olkaria of Kenya. Most of
the target sites in Ethiopia are considered to be geologically promising site in the entire
African Rift.
FeO-MgO-K2O+Na2O Diagram
FeO-MgO-K2O+Na2O Diagram is commonly used for the trend of magmatic segregation in
rock series. Figure 3.2 shows the results of analysis for the project with the results of existing
reports. Analyzed data were in good agreement with the data in existing reports. Almost all the
samples showed similar trends to that of tholeiitic series. All the sites are considered to have
similar characteristics such as depth of magma chamber, cooling speed, and others.
Source: JICA Project Team
Figure 3.1 SiO2-K2O+Na2O Diagram (TAS Diagram)
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Source: JICA Project Team
Figure 3.2 FeO-MgO-K2O+Na2O Diagram
4) Result of XRD Analysis for Alteration Minerals
Table 3.4 shows the results of determination of minerals by XRD.
Table 3.4 Mineral Occurrence by XRD
Source: JICA Project Team
Rock alteration was observed only around geothermal manifestations. Wider areas of alteration
zone were not identified, except for Dofan and Meteka sites.
Table 3.4 shows that sites are characterized by the occurrence of Quartz, Opal-A, Opal-CT,
Clinoptilorite, Halloysite, Smectite, which suggests that low-grade alteration occurred in those
sites. The occurrence of Kaolinite at Gedemsa and Finkilo sites shows trace of hydrothermal
alteration.
No. Site Location Sample Quartz Opal - CT Opal - A Clinoptilolite Kaolinite Halloysite Smectite
140119-02 Bobesa (Aluto-2) Bobessa Altered Clay △ + 140120-03A Bobesa Bobessa Altered Obsidian + - 140120-03B Bobesa Bobessa Zeolite + - 140120-04 Bobesa Bobessa Altered Rock - + 140120-05 Bobesa Bobessa Secondary Mineral + 140120-06 Bobesa Gebiba Clay Mineral + 140121-03 Finkilo (Aluto-3) Finkilo Yellow Tuff - - 140122-02 Finkilo Adoshe Yellow Clay + + 140122-03 Finkilo Adoshe Red Clay - - 140122-04 Finkilo Adoshe White Mineral ○ - 140122-05 Finkilo Humo Clay - + + 140122-06 Finkilo Humo White Mineral + 140122-07 Finkilo Shutie Clay △ + 140122-08 Finkilo Shutie White Mineral △ - 140125-01 Gedemsa Sambo Zeolite Vein - + + 140125-03 Gedemsa Sambo Altered Welded Tuff ○ 140125-04 Gedemsa Sambo White Mineral ○ + + 140126-01 Nazereth Boko Yellow Tuff △ ○ 140131-03 Boseti Kintano Altered Andesite - - 140131-04 Boseti Kintano White Mineral + +
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3.3.2 Geochemistry –Summary
(1) Objectives
In order to characterize the geothermal reservoirs, site reconnaissance of geothermal manifestations,
sampling and analysis of geothermal fluid and gas, and examination of the analysis results were
conducted. The results of the examination are summarized below.
(2) Methodology
In the site reconnaissance, geothermal manifestations, river, and lake were surveyed at 71 points in
total. At the survey points, location (coordinate), altitude, temperature, pH, and conductivity were
measured, and samples (32 water and 11 gas samples) were collected from 41 points. The survey areas
are as follows:
The second site reconnaissance: Aluto, Bobesa, Finkilo, Gedemsa, Nazreth, Boseti, and Kone
The third site reconnaissance: Dofan, Meteka, Dubti (Tendaho-1), Ayrobeda (Tendaho-2),
Allalobeda (Tendaho-3), Seha, Lake Loma, Boseti (additional survey), Dallol, Arabi, and Erer
(3) Results
Site reconnaissance
The results of the site reconnaissance revealed the facts as below.
In the southwestern part of the Ethiopian Rift Valley, a main geothermal manifestation is fumarole
located in uplands. Fumaroles whose temperature is more than 90°C are located in Aluto, Bobesa, and
Gebiba; only the fumaroles in Gebiba show a boiling temperature in the southwestern part. The other
fumaroles are of lower temperatures (70-90°C) less than a boiling temperature. Hot springs are
distributed mainly in lowlands around Langano Lake and the Nazareth area. Their temperatures are
middle to low, ranging from 65° to 35°C, and boiling spring were not found. Relatively high
temperatures are 65°C of Ouitu (Langano Lake) and 50°C of Sodere (Nazareth).
In the northeastern part of the Ethiopian Rift Valley, fumaroles and hot springs are distributed in
upland and lowland areas. The manifestations show temperatures higher than those in the
southwestern part. Fumaroles with temperatures higher than 90°C are located in Dofan, Dubti,
Ayrobeda. In Dubti and Ayrobeda, temperatures of fumaroles are slightly higher than a boiling
temperature. Hot springs distributed in Dofan, Meteka, Allalobeda, and Seha; there are hot springs
with the temperature higher than 80°C, except for Dofan. A boiling hot spring is located at Allalobeda.
Taking a wide view of the Ethiopian Rift Valley, Aluto-Langano and Tendaho are the remarkable sites
showing prominent activity of geothermal manifestations.
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(4) Interpretation of analytical results of samples
Origin of geothermal fluid
Origin of geothermal fluid can be meteoric water as inferred by the isotopic composition of the
geothermal and river/lake waters.
Main anion composition, pH, and isotopic composition of water samples show regional properties in
chemical composition as below.
The geothermal waters in Lake District and Southern Afar are rich in HCO3, on the
contrary, the geothermal waters in Northern Afar are rich in Cl.
In Lake District, the anion composition of the surface water rich in HCO3 is
unchangeable in the geothermal reservoir where the surface water penetrates, and hence
HCO3-rich water can be reservoir water in the southwestern part of the Ethiopian Rift
Valley.
The similarity in the anion composition between geothermal wells and hot springs
indicates that the geothermal fluid taken from Aluto and Langano areas belong to a
single geothermal system.
The geothermal waters in Northern Afar are rich in Cl, and hence similar to those in the
geothermal systems in subduction zones.
The geothermal waters in Tendaho show oxygen shift in the isotopic composition,
which means a progress of water-rock interaction.
The chemistry of Dallol hot spring can be strongly affected by volcanic HCl gas.
(5) Application of geochemical thermometers to geothermal fluid
Na-K-Mg diagram implies that waters from geothermal wells in Tendaho and hot springs in
Allalobeda are fully equilibrated with surrounding rock. On the contrary, waters from geothermal
wells in Aluto and hot springs of Oiutu in Langano are partially equilibrated with surrounding rock
and the other hot spring waters are immature in the state of water-rock interaction.
Comparison among geochemical temperatures and temperatures obtained by well loggings provides
conditions as follows: [1] the quartz thermometer shows a good agreement with well-logging
temperatures of geothermal wells, [2] temperatures calculated with the quartz thermometer converge
within a narrow range in each survey site, so that the quartz temperatures can be recognized as a
representative one of the hot spring aquifer, [3] geochemical temperatures of hot springs, except for
quartz temperatures of Allalobeda, are lower than those of geothermal wells. [4] There is no a single
trend in the orders of temperatures between quartz and Na-K/Na-K-Ca temperatures throughout the all
survey sites.
The conditions above demonstrate that no geochemical temperature of hot spring can directly indicate
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plausible reservoir temperature. For this reason, with an assumption where the temperature difference
between the geothermal reservoir and hot spring aquifer is represented by the difference in quartz
temperature between a geothermal well in Aluto and hot springs in Langano, the reservoir
temperatures were estimated by adding the temperature difference to the quartz temperatures of hot
springs for each survey site.
Using the estimated reservoir temperatures and distribution density and activity of geothermal
manifestations, the conditions of the reservoir temperature used in a volumetric method were arranged
in the four classes of temperature ranges: A: 240°C–290°C, B: 210°C–260°C, C: 170°C–220°C, D:
130°C–170°C.
(6) Geochemical properties of fumarolic gas and steam from a geothermal well
Chemical and noble gas isotopic compositions of fumarolic gas and steam from a geothermal well
demonstrate that the origin of the geothermal gas in the Ethiopian Rift Valley is gas emanating from
the mantle. The mantle component in the geothermal gas, thus, can be an indicator of the mantle or the
magma generated from the mantle as the heat source. Furthermore, the movement of the gas indicates
a flow path running from a depth to the surface, that is, a fracture zone. Therefore, it can be said that
the obvious contribution of the mantle component in the geothermal gas indicates a highly potential
geothermal reservoir at a depth.
(7) Verification of analytical precision at GSE
In order to verify the precision of chemical analysis at GSE, GSE and the JICA study team analyzed
shared water samples, and compared the both results. The results and conclusions of the comparison
are as follows.
GSE has sufficient analytical precision for pH, EC (electric conductivity), Cl, SO4,
HCO3, F, Na, and K.
GSE’s results show that insufficient analytical precision for a high concentration of
SiO2. A cause of this issue might be a lack of digesting of polymerized silica in the
process of the analysis.
Because K is an important component used in geochemical thermometers, it is
preferable for GSE to improve the analytical precision of K in high concentration.
GSE's analytical precision is insufficient for Ca and Mg. A solution to this problem is
use of ICP atomic emission spectroscopy.
The top priority in the chemical analysis at the GSE laboratory is to achieve sufficient
analytical precision for a high concentration of SiO2 and K. For this reason, in the
training course for GSE in Japan, engineers were trained in SiO2 measurement with
spectrophotometry, and Na and K with flame atomic emission spectroscopy. These
methods are simple and required apparatus is relatively inexpensive, so that the
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employment of these methods is effective in capacity building of the GSE laboratory.
3.4 Preliminary Reservoir Assessment 3.4.1 Objectives
The preliminary geothermal reservoir source assessment was conducted to facilitate the results as
basic information for formulating Master Plan on Geothermal Energy Development.
3.4.2 Definition of Resource and Reserve
For this study, the geothermal resource was described according to the definition of Australian
Geothermal Energy Group Geothermal Code Committee (AGRCC) in the “Geothermal Lexicon for
Resources and Reserves Definition and Reporting Edition 2 (2010)”. This definition is the most
distinct for resource evaluation at the early stage among similar studies according to the International
Energy Agency (IEA)’s comparative study.
The Federal Democratic Republic of Ethiopia’s Scaling-Up Renewable Energy Program Ethiopia
Investment Plan (Draft Final) shows that the planning aspects of geothermal projects consist of eight
stages. The comparison between these eight stages and AGRCC’s categories is shown in Table 3.5.
Table 3.5 Comparison between Eight Stages and AGRCC’s Categories
Eight Development Stages in Ethiopia AGRCC, 2010
Resource Reserve (i) Review of existing information on a prospect
Inferred - (ii) Detailed surface exploration (geology, geochemistry, and
geophysics) (iii) Exploration drilling and testing (minimum of three wells)
Indicated Probable (iv) Appraisal drilling and well testing
(v) Feasibility studies
Measured Proven (vi) Productive drilling, power plant design, EIA, and reservoir
evaluation (vii) Power station construction and commissioning
(viii) Reservoir management and further development
(Source: JICA Project Team)
There are no boring holes drilled in the geothermal reservoir in the surveyed sites except Aluto and
Tendaho. Therefore, the geothermal resources of all other sites are classified under “inferred
resources”. On the other hand, Aluto-1 (Aluto-Langano) and Tendaho-1(Tendaho-Dubti) sites are
classified as “indicated resource” and/or “measured resource”.
3.4.3 Methodology of Reservoir Resource Assessment – Volumetric Method
The Volumetric method is used for the reservoir resource assessment. The method was introduced by
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USGS (1978) for a rapid assessment. However, the USGS calculation method has appeared not to be
prevailing in references. Instead, an equation, similar to USGS’s in form but different from it in
concept, has been used in many references; therein, unreasonably higher temperatures have been used
as the reference temperature. Instead, the JICA Team herein uses a rational and practical calculation
method for the assessment of reservoir with temperature not less than 180 ºC shown below.
3.4.4 Probabilistic Approach - Monte-Carlo Method
As a probabilistic approach, the Monte Carlo method was used. The software was the Cristal Ball of
Oracle Company. The calculation conditions are given in the table below.
3.4.5 Proposed the parameters
There has not been much information to determine the necessary parameters for the volumetric
method. Hereunder described explanations on how the essential parameters have been proposed for
future reviews as development states should proceed.
(1) Proposal of the reservoir volumes
In most of the target geothermal sites, surface geological and geochemical surveys only were
conducted. Under this circumstance, reservoir volumes were determined with the following
procedures.
The target sites were grouped into three categories (i.e. volcano type, caldera type and graben
type) based on the satellite image analysis and site survey;
Maximum plane area of each site was first determined.
Most likely plane area of each site then was determined with reference to the existing survey
information of Aluto-Langano, Tendaho-Dubti and Corbetti, where MT/TEM survey was
already conducted;
The most likely plane area determined above was adjusted to accommodate field conditions in
accordance with intensity of geothermal manifestations and/or fractures.
Minimum plane area is assumed as zero.
(2) Determination of Reservoir thickness
The parameters shown in the Table 3.6 were assumed.
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Table 3.6 Determination of Geothermal Reservoir Thickness
Items Minimum Maximum Most
Probably Notes
Depth to Reservoir top (GL-)
0.5 km 1.0 km 0.8 km Existing information was referred to for “most probably” determination
Depth to Reservoir bottom (GL-)
3.0 km 3.0 km 3.0 km -A depth economically reachable by the present or near future technology
Reservoir Thickness 2.5 km 2.0 km 2.2 km -
Source: JICA Project Team
(3) Determination of Average Reservoir Temperatures
The reservoir average temperatures were proposed in Table 3.7 based on the geochemical assessment
conducted by the Master Plan Project.
Table 3.7 Average Reservoir Temperatures
Class Min Max Most Probably
Remarks
Class A 240 290 265 6 sites (Tendaho and Aluto) Class B 210 260 235 7 sites (Boseti, Meteka, etc.) Class C 170 220 195 7 sites (Nazareth, Arabi, etc) Class D 130 170 150 2 sites (Gedemsa and Kone)
Source: JICA Project Team
(4) Geothermal Power Plant Type Assumed
A typical single flash power plant a-is assumed for average reservoir temperature not less than 200 ºC
and binary power plant for average reservoir temperature less than 200 ºC. The Class C geothermal
reservoir includes both temperature categories above 200 ºC and below 200 ºC. For such case, a flash
type power plant was selected from a practical and economical point of view, by assuming that 40% of
the geothermal reservoir would be above 200 ºC. There will be possibilities that double flash type or
Flash/binary combined type may be adopted. However, there are not be sufficient information to
examine such possibilities at this stage; and possible increment due to those option will be minimal
compared to cost impact, thus those examination was not included in this assessment.
Source: JICA Project Team
Figure 3.3 Average Reservoir Temperature and Power Plant Type
Temperture
Class A
Class B
Class C
Class D
Calculation
100 150 200 250 300
Binary Single Flash
100%
100%
40%
100%
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3.4.6 Results of Reservoir Assessment
The assessment results are shown in Table 3.8. The assessment resulted that the most likely value
(‘mode’ in statistic term) is 4,200 MW, value at occurrence probability 80% is 2,000 MW and the
value at occurrence probability 20% is 11,000 MW. There 12 geothermal prospects that may have
resources more than 100 MW.
It is noted that this calculation results provided the resource estimation of “Inferred level” in principle.
However, the total calculation result (91 MW) of Aluto-1 (Aluto-Langano) will include 70 MW of
‘Indicated Resource’ and 5 MW of ‘Measured Resource’; because 70 MW has been estimated by a
numerical simulation and 5 MW is the power output of the pilot plant. Similarly, 10 MW of
(Indicated resource) that was estimated by a Pre-feasibility Study (2014) is included in 290 MW of
Tendaho-1 (Dubti).
Table 3.8 Resource assessment Unit: MW
Target Site
Site No. Cumulative
probability 80% Most Probable
(mode) Cumulative
probability 20% 19 Corbetti 480 960 2400 16 Abaya 390 790 1900 13 Tulu Moye 202 390 1100 18 Boseti 160 320 800 21 Tendaho-1 140 290 660 4 Damali 120 230 760 7 Meteka 61 130 290 2 Tendaho-3 64 120 320
17 Fantale 64 120 320 14 Aluto-2 58 110 290 22 Tendaho-2 47 100 230 3 Boina 56 100 350
20 Aluto-1 49 91 180 9 Dofan 41 86 200
15 Aluto-3 23 50 110 1 Dallol 23 44 120
12 Gedemsa 20 37 100 11 Nazreth 17 33 100 10 Kone 7 14 42 6 Danab 6 11 30 5 Teo 4 9 23 8 Arabi 4 7 36
New/ Divided Site 7-2 Meteka-Ayelu 47 53 250 7-1 Meteka-Amoissa 28 89 150 23 Butajira 6 16 30
Total 2114 4200 10791
Updated After MT/TEM Survey (See Chapter 7)
18 Boseti 175 265 490 22 Tendaho-2 120 180 320
Source: JICA Project Team
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4. ENVIRONMENTAL AND SOCIAL CONSIDERATIONS
4.1 Outline of Environmental and Social Impact Assessment Study
The Environmental and Social Impact Assessment (ESIA) study was conducted to evaluate potential
environmental impacts due to the geothermal energy development at Initial environmental
examination (IEE) level with a comparison of several alternatives.
4.1.1 Objectives of ESIA Study
The main objectives of the ESIA Study are as follows:
To collect natural and social environmental baseline information in order to identify and assess
the potential impacts caused by the Project.
To identify and assess potential impacts on the social/natural environment and pollution caused
by the Project, and
To prepare the management and monitoring plan for necessary actions toward the potential
environmental and social impacts as well as to proposed mitigation measures.
4.1.2 Tasks of ESIA Study
The ESIA Study consists of the following six main tasks.
Baseline survey (collection and compilation of readily available data and information, and
literature review);
Study on alternative plans applying the concept of strategic environment assessment (SEA);
Scoping of the environmental impacts caused by the Project activities;
Prediction and assessment of natural and socio-environmental impacts caused by the Project in
the level of initial environmental examination (pre-IEE);
Mitigation and monitoring plan study; and
Stakeholders’ meeting.
4.2 Environmental Laws and Regulations
4.2.1 Framework of environmental and social laws and regulations
Major Regulations, Guidelines and Proclamations applicable to the geothermal energy development
project are listed in Table 4.1 below.
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Table 4.1 Major Regulations, Guidelines and Proclamations No. Title No. Date of Issue 1 Environmental Impact Assessment Proclamation 299 31 Dec, 2002 2 Environmental Pollution Control Proclamation 300 03 Dec, 2002 3 Environmental Protection Organs Establishment Proclamation 295 31 Oct, 2002 4 Expropriation of Landholdings for Public Purposes and Payment of
Compensation Proclamation 455 15 Jul, 2005
5 Rural Land Administration and land Use Proclamation, Proclamation 456 15 Jul, 2005 6 Ethiopian Water Resource Management Proclamation 197 Mar, 2000 7 Solid Waste Management Proclamation 513 12 Feb, 2007 8 Environmental Impact Assessment Procedural Guideline Series 1 Nov, 2003 9 Draft EMP for the Identified Sectoral Developments in the Ethiopian
Sustainable Development & Poverty Reduction (ESDPRP) 01 May, 2004
10 Investment Proclamation 280 02 Jul, 2002 11 Council of Ministers Regulations on Investment Incentives and
Investment Areas Reserved for Domestic Investors 84 07 Feb, 2003
12 The FDRE Proclamation, “Payment of Compensation for Property Situated on Landholdins Expropriated for Public Purposes”
455 2005
13 Council of Ministers Regulation, “Payment of Compensation for Property Situated on Landholdins Expropriated for Public Purposes”
135 2007
14 Oromia Regional Administration Council Directives, “Payment of Compensation for Property Situated on Landholdins Expropriated for Public Purposes”
5 2003
15 Investment (Amendment) Proclamation 373 Oct, 2003
Source: JICA Project Team
4.2.2 Environmental Impact Assessment
(1) Laws and regulations relating to EIA in Ethiopia
According to the EIA Procedural Guideline, projects are categorized into three schedules:
Schedule-1: Projects, which may have adverse and significant environmental impacts and therefore
require a full Environmental Impact Assessment.
Schedule-2: Projects whose type, scale or other relevant characteristics have potential to cause some
significant environmental impacts but are not likely to warrant a full EIA study.
Schedule-3: Projects which would have no impact and do not require an EIA.
Projects for geothermal power plant fall under the schedule I activities.
(2) EIA Process
The general description of the EIA process and the permit requirements are detailed in the EIA
Procedural Guideline Series 1 of the FDRE. As a minimum, the following descriptions shall be
presented:
the nature of the project, including the technology and processes to be used and their physical
impacts;
the content and amount of pollutants that will be released during implementation as well as
during operation;
source and amount of energy required for operation;
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characteristics and duration of all the estimated direct or indirect, positive or negative impacts
on living things and the physical environment;
measures proposed to eliminate, minimize, or mitigate negative impacts;
a contingency plan in case of accidents;
Procedures of internal monitoring and auditing during implementation and operation.
Environment related standards and Limit Values
The following standard and limit values were indentified for an application to geothermal energy
development projects.
Draft Standards for Industrial Emission and Effluent Limits (Ethiopian EPA)
National Noise Standard at Noise Sensitive Areas
Environmental, Health and Safety (EHS) Guidelines for Emission Gas (World Bank)
EHS Guidelines for Effluent (World Bank)
EHS Guidelines for Noise Management (World Bank)
(3) Legislation related to the resettlement and land acquisition
Constitution (1995) assure right of private property for citizen but not land ownership. The land is
recognized as public common property and its usufruct right can be processed, sold and transferred by
citizens. “Federal Democratic Republic of Ethiopia Rural Land Administration and land Use
Proclamation, Proclamation No.456/2005” provides the rural land use right. The law also prescribes
the governmental responsibility that regional government have obligation to organize adequate
legislative administration under the central governmental policy.
Principle of the land acquisition for the public purpose is provided in the constitution (1995) and the
detail procedure such as expropriation process and compensation standard are prescribed in “the
Expropriation of Landholding for Public Purposes and Payment of Compensation Proclamation,
Proclamation No. 455/2005”. “Payment of Compensation for Property Situated on Landholdings
Expropriated for Public Purposes, Council Ministers Regulation No. 135/2007” also provides further
detail standard such as compensation standard for the each expropriating asset. According to the
regulation (2007), land expropriation is implemented by local government, Woreda or Urban
administration exclusively for the public purpose and it should be adequately compensated to PAPs.
(4) Gaps between Ethiopian Legislations and JICA Guidelines (2010) Policies on Environmental Assessment
The JICA Environmental guidelines and the legislation in the country do not have major contradiction,
except perhaps certain procedural adjustments during project implementation such as public
consultation and public disclosure.
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4.2.3 Institutional Framework of Environmental Management in Ethiopia
The most important step in setting up the legal framework for the environmental in Ethiopia has been
the establishment of the Environmental Protection Authority (EPA). The EPA, established under the
proclamation no. 295/2002, is now a ministerial level environmental regulatory and monitoring body.
The objectives of the EPA are to formulate policies, strategies, laws and standards. It is, therefore, the
responsibility of the EPA. in the EIA process.
The proposed geothermal power plants are subject to several policies and programs aimed at
development and environmental protection. The EPA regulates the environmental management
system for all projects across the country. Following shows the major institutions or organizations.
Regional Government
The Geological Survey of Ethiopia (GSE)
Ministry of Water and Energy (MoWE)
Ethiopian Electric Power Corporation (EEPCo)
Pastoralist and Agricultural and Rural Development Office of Regional State
Corporate Planning Department of EEP
4.3 Baseline Survey
4.3.1 Methodology of Baseline survey
Standard methodologies to collect data and information at the prospective geothermal energy
development sites were applied.
4.3.2 The Baseline data
As the baseline, following data were collected.
Profile of the Study Area
Natural, Historical and Cultural Heritages
Ecological Protected Area
Possible Impacts by Transmission Line
4.4 Strategic Environmental Assessment (SEA)
Although implementation of SEA for development projects is not compulsory at present in Ethiopia,
considering the definition and the concept of SEA mentioned above, SEA for geothermal energy
projects were discussed in this report in the following point of views.
Ethiopian energy policy on geothermal development,Conservation strategy of Ethiopia (CSE)
Environmental Policy of Ethiopia (EPE)
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National Energy Development Policy
Project alternatives including “do-nothing” optionEnergy Resource Alternatives
Project Alternatives
Project perspective from guidelines of financial institutions,
Alignment of JICA guidelines with national policies
4.5 Implementation of IEE
An Initial Environmental Examination (IEE) was carried out based on the baseline data and
information, namely readily available information including existing data and simple field surveys.
4.5.1 Project Categorization
(1) General
According to the JICA Environmental Guidelines (April 2010), projects are classified into four
categories. Table 4.2 below shows the comparison of projects categorization defined by JICA and
Ethiopian national EPA Guideline.
Table 4.2 Environmental Categorization of Projects
Project type JICA GuidelinesEthiopia EPA
GuidelineEIA requirement
Likely to have significant adverse impacts on the environment and society. Projects with complicated or unprecedented impacts that are difficult to assess, or projects with a wide range of impacts or irreversible impacts
Category A Schedule-1 Full EIA
Have potential adverse impacts on the environment and society are less adverse than those of Category A projects. Generally, they are site-specific; few if any are irreversible; and in most cases, normal mitigation measures can be designed more read
Category B Schedule-2Not likely to warrant
a full EIA study
Have are likely to have minimal or little adverse impact on the environment and society.
Category C Schedule-3
Environmental review will not proceed after categorization
Projects which satisfy the following JICA’s requirements: projects of JICA’s funding to a financial intermediary or executing agency; the selection and appraisal of the sub-projects is substantially undertaken by such an institution only after JICA’s approval of the funding, so that the sub-projects cannot be specified prior to JICA’s approval of funding (or project appraisal); and those sub-projects are expected to have a potential impact on the environment.
Category FI -Environmental
review will proceed after categorization
(Source: JICA Study Team)
(2) Classification of geothermal energy development project
Appendix I (Schedule of Activities) of the Environmental Impact Assessment Guideline Document
(May 2000) classifies projects by their type of activities. Based on the project classification,
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geothermal energy development projects with capacities more than 25 MW require the
implementation of full scale EIA.
4.5.2 Scoping for Initial Environmental Examination
Geothermal energy is generally more environmentally sound compare to other energy sources such
as fossil fuel burnings, there are certain negative impacts that must be considered and managed when
geothermal energy is to be developed.
Most of potentially important impacts of geothermal power plant development are associated with
groundwater use and contamination, and with related concerns about land subsidence and induced
seismicity as a result of water injection and production into and out of a fractured reservoir
formation. Some considerations should also be taken for issues of air pollution, noise, safety, and
land use.
4.5.3 Socio-environmental Interactions
In order to grasp the livelihood conditions in and around the prospective sites, questionnaire surveys
for energy and water sector offices at woreda levels were conducted.
The survey revealed that the main source of energy both for cooking and light was fuel wood, coal
and dung. In addition to this, energy consumption per capita of the community is very low.
With regard to water source and supply, there is critical shortage of sufficient and uninterrupted
water supply. But in all other sites, access to potable (treated) water is still a priority. There seemed
to be water resource competition and fast land use change in some of the surveyed areas. The finding
revealed that the community believed the project would bring about little negative impact. However
in terms of the serious shortage of water all community in all sites required the supply of water. Thus
there is a strong need of residents to implement community projects to access potable water source,
parallel to the main geothermal project.
4.5.4 Displacement and Resettlement
The scale of geothermal energy development project is not yet determined at present, some of the
areas within the prospective sites shall be acquired by the project proponent for implementation of the
project. Data and Information on land clam were collected through interviews at kebele level in the
prospective sites. After the determination of the project site and the project scale, detailed land
boundary should be settled according to the land acquisition procedure of the government of Ethiopia.
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4.6 Environmental Management Plan
4.6.1 Environmental Management Plan (EMP)
Environmental Management Plan (EMP) is prepared on the basis of identified impacts and their level
of significance. Significant impacts that are detailed in the previous section shall be mitigated through
appropriate methods and then subject to mechanisms of environmental management plan using
monitoring and auditing as instrument.
4.6.2 Monitoring plan
Environmental monitoring plan is included in the EMP. Environmental monitoring and auditing shall
be undertaken in all phases of project activities to check that the proposed environmental management
measures are being satisfactorily implemented and that they are delivering appropriate level of
environmental performances. A general form of monitoring plan to be applied to the prospective sites
was given in this report.
4.7 Consultation with stakeholder
Stakeholder Consultations were implemented in the ESIA Study, namely at scoping stage, through
the interviews at communities (March –July 2014).
Consultation with stakeholder at the prospective sites had been conducted through interview and using
questionnaires. Interview and questionnaire surveys had been conducted at seven woreda-level sector
offices, and more than 100 officials from different sectors were participated. In order to remove the
issues and concerns of the community, due regards and detailed explanations were given to the
community based on the legal, social and environmental land regulations stated in the proclamation of
Federal Republic of Ethiopia No. 1/1995..
4.8 Recommendation6
Geothermal energy development projects with a capacity more than 25 MW shall require the
implementation of full scale EIA prior to the implementation of the project. The EIA process consists
of series of several procedural phases starting from pre-screening consultation with EPC and
submission of a screening report and ending up by obtaining an EIA approval. The project proponent
should start the EIA procedures in cooperation with other sectoral agencies such as Ministry of
Water, Irrigation and Energy (MoWIE), regional governments, etc. For the implementation of the
EIA, followings should be noted:
EIA should be conducted in accordance with the Ethiopian EIA process.
EIA should be carried out for the selected site by the project proponent according to the
Ethiopian Guidelines and/or international requirements.
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After the determination of the project site(s), EIA should start prior to the test drillings, and
continuously conducted parallel to the test drilling.
The EIA report prepared based on above shall be revised considering the results of the test
drilling above. Results of ESIA survey conducted in this master plan study can be utilized for
the implementation of the EIA
Additional EIA should be conducted if necessary according to the revised EIA report.
The EIA is to be conducted considering the specific features of environmental impacts of
geothermal energy development.
EIA approval should be obtained before the application of the development right of the project.
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5. FORMULATION OF MASTER PLAN
5.1 Target and Methodology
The master plan was formulated by first setting out the development targets and then by prioritizing
the identified candidate projects to meet the targets set out.
5.1.1 Target of the Master Plan
Table 5.1 gives the development targets for this master plan.
Table 5.1 Development Target of the Master Plan Item Target Remarks
Period
2015–2037 (23 years) Short term: 2015-2018 (4 years) Medium term: 2019-2025 (7 years) Long term: 2026-2037 (12 years)
EEP MP: 2013–2037 (25 years) Wind and Solar MP: 2011–2020 (10 years)
Installed Capacity Short term 700 MW Committed and ongoing sites Medium term 1,200 MW Same target as EEP MP Long term 5,000 MW Same target as EEP MP
MP: Master Plan Source: JICA Project Team
5.1.2 Methodology of the Master Plan
Five criteria are used: (i) development status, (ii) environmental risks, (iii) geothermal potential, (iv)
economics, and (v) site specific factors.
5.2 Multi-Criteria Analysis for Prioritizing the Geological Prospects
5.2.1 Factors to be Considered
(1) Development Status
Using the Australian Geothermal Reporting Code Committee classification, reliability of geothermal
resource evaluation was classified.
Table 5.2 below shows the classification of geothermal resources. Aluto-1 (Aluto-Langano) and
Tendaho-1 (Dubti), where some test drillings were already done, are evaluated as “measured” and
“indicated” resource, respectively. Other sites where any detailed exploration surveys have yet to be
done are evaluated as inferred resource.
(2) Socio-environmental Impact
According to the environmental and social consideration, Fantale geothermal prospect is located
in/around the Awash National Park. For this reason, Fantale prospect is given a low priority in the
ranking. The other 21 geothermal sites are not located in the range of the national park and do not
have immitigable adverse environmental risks and impacts.
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(3) Geothermal Potential
In this study, the installed capacity of each power plant is set as equal to the geothermal potential (at
the most probable case) in each prospect except Aluto-1 (Aluto-Langano). Other donors of a private
firm have started development and drilling surveys of some of the prospects, such as Corbetti,
Aluto-1 (Aluto-Langano), and Tendaho-1 (Dubti). Kone and Gedemsa where the estimated
temperature were as low as 130~170 °C (based on the geochemical analysis), were suitable only for
binary-type generation. Therefore, Kone and Gedemsa prospects were placed at a lower priority due
to extremely low power output with higher energy cost.
Table 5.2 Development Status and Geothermal Resource
Site Temperature
Class Geothermal Resource
Inferred Indicated Measured 1 Dallol B 44 N/A N/A 2 Tendaho-3 (Allalobeda) A 120 N/A N/A 3 Boina C 100 N/A N/A 4 Damali C 230 N/A N/A 5 Teo B 9 N/A N/A 6 Danab B 11 N/A N/A 7 Meteka B 130 N/A N/A 8 Arabi C 7 N/A N/A 9 Dofan B 86 N/A N/A 10 Kone D 14 N/A N/A 11 Nazareth C 33 N/A N/A 12 Gedemsa D 37 N/A N/A 13 Tulu Moye C 390 N/A N/A 14 Aluto-2 (Finkilo) A 110 N/A N/A 15 Aluto-3 (Bobessa) A 50 N/A N/A 16 Abaya B 790 N/A N/A 17 Fantale C 120 N/A N/A 18 Boseti B 265 N/A N/A 19 Corbetti B 1000*1 N/A N/A 20 Aluto-1 (Aluto-Langano) A 16 70*2 5 21 Tendaho-1 (Dubti) A 280 10*3 N/A 22 Tendaho-2 (Ayrobera) A 180 N/A N/A
N/A: Not available *1 Reykjavík Geothermal *2 Study on Geothermal Power Development Project in the Aluto Langano Field, Ethiopia, METI (Japan), 2010, *3 Consultancy Services for Tendaho Geothermal Resources Development feasibility Study, ELC, 2013
Source: JICA Project Team
(4) Economics of Candidate Plants
The project economics are measured by two indicators: (i) generation cost and (ii) economic
viability.
Cost of Electricity Generation
To compare the competing power plants (geothermal, hydropower and other plant types), the
electricity generation costs (cost of generation) per kWh are calculated.
The results are shown in Table 5.3 below.
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Table 5.3 Ranking Order of the Geothermal Prospects
Source: JICA Project Team
Figure 5.1 and Figure 5.2 compares the generation costs of geothermal and hydropower, and
geothermal and other power plants respectively.
Generally, the generation cost of hydropower is lower than that of geothermal power plants.
However, some geothermal power plants are much more competitive and are more reasonable than
some candidate hydropower plants with similar capacity. In comparison with other renewable energy
and thermal power plants, the geothermal prospects ranked No.1 to No.11 in Table 5.3 are superior to
even Adama and Ashegoda wind farm that exceeds US$0.08/kWh.
Therefore, from the point of view of least cost generation, geothermal must be prioritized over wind
and solar in Ethiopia. The geothermal prospects with generation cost of US$0.10/kWh are almost
equal to wind and solar and more economical than gas turbine and diesel. The diesel generation and
waste from energy are much more expensive than the geothermal prospects.
RankingOrder
Geothermal SiteTemp.Class
InstalledCapacity
(MW)
Cost of Genaration
($/kWh)Remarks
1 Tendaho-1(Dubti) A 290 0.0572 Shallow reservoir is committed.2 Aluto-2 (Finkilo) A 110 0.05853 Corbetti B 1,000 0.0589 Committed site4 Aluto-3 (Bobesa) A 50 0.05925 Tendaho-2 (Ayrobera) A 180 0.05936 Tendaho-3 (Allalobeda) A 120 0.0621 Committed site7 Aluto-1 (Langano) A 75 0.0700 Committed site8 Abaya B 790 0.07179 Boseti B 265 0.072110 Meteka B 130 0.073111 Dofan B 86 0.0783
12 Tulu Moye C 390 0.1037
13 Teo B 9 0.104014 Fantale C 120 0.105015 Dallol B 44 0.107616 Damali C 230 0.108417 Nazareth C 33 0.109118 Boina C 100 0.1111
19 Danab B 11 0.1700
20 Arabi C 7 0.1872- Gedemsa D 37 - Low temperature- Kone D 14 - Low temperature
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Source: JICA Project Team
Figure 5.1 Generation Cost of Geothermal and Hydropower Plants
Source: JICA Project Team
Figure 5.2 Generation Cost of Geothermal and Other Power Plants If the Government of Ethiopia adopts preferential policy such as advantageous interest rate to
promote geothermal development, geothermal is expected to become more competitive.
Economic Viability
The economic viability of a geothermal plant is evaluated using the economic internal rate of return
(EIRR). The EIRRs are given in Table 5.2. Out of 18 projects, 16 are economically viable since the
EIRRs are more than the hurdle rate of 10%. Two projects (Danab and Arabi) are not economically
viable.
0.0000
0.0500
0.1000
0.1500
0.2000
0.2500
0.3000
0 100 200 300 400 500 600 700 800 900 1000
Ene
rgy
Cos
t ($
/kW
h)
Installed Capacity (MW)
Geothermal Site Wind Farm
Solar Energy from Waste
Biomass Gas Turbine
Diesel (HFO) CCGT
CandidateHydropower Plant
Aluto-Langano
Abaya
Corbetti
Meteka BosetiTulu Moye
Dubti
Damali
Allalobeda
Finkilo
Ayrobera
Bobesa
Dofan
Arabi
Wind
Solar
Energy from Waste
CCGT
Diesel (HFO)
Gas Turbine
Candidate Hydropower
Boina
Teo
0.0000
0.0500
0.1000
0.1500
0.2000
0.2500
0.3000
0 100 200 300 400 500 600 700 800 900 1000
Cos
t of G
ener
atio
n (
$/kW
h)
Installed Capacity (MW)
Geothermal Site Wind Farm
Solar Energy from Waste
Biomass Gas Turbine
Diesel (HFO) CCGT
Aluto-Langano
Abaya
Corbetti
Meteka Boseti
Tulu Moye
Dubti
Damali
Allalobeda
Finkilo Ayrobera
Bobesa
DofanWind-Ashegoda
Wind-AdamaSolar
Energy from Waste
CCGT
Diesel (HFO)
Gas Turbine
Boina
Teo
Danab
Arabi
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Table 5.4 Ranking of Geothermal Power Plants and EIRR
Source: JICA Project Team
(5) Site Specific Factors
i) Socio-environmental Impact
Social and environmental impact, except for national park, is taken into consideration for the
prioritization. In addition, it was judged that there would be a potential conflict with local
people in the Dofan prospect. Therefore, Dofan was adjusted to be ranked below the level of the
economy group.
ii) Accessibility to the Sites
Taking into consideration the topography along the access road as well as for security measures,
cost of civil works for the access road and earthworks in the site was estimated as preparatory
work in the construction cost mentioned above. Because the poor accessibility reflects the
generation cost, prospects located in remote areas such as Damali and Danab are evaluated low
in the rank order of the generation cost.
5.2.2 Prioritization of the Geothermal Prospects
To sum up the prioritization of geothermal prospects using multi-criteria analysis mentioned above,
the prioritization order is summarized as shown in Table 5.5.
RankingOrder
Geothermal SiteInstalledCapacity
(MW)
Cost ofGenaration ($/kWh)
EIRR(%)
1 Tendaho-1(Dubti) 290 0.0572 31.7%
2 Aluto-2 (Finkilo) 110 0.0585 31.1%
3 Corbetti 1,000 0.0589 -
4 Aluto-3 (Bobesa) 50 0.0592 30.7%
5 Tendaho-2 (Ayrobera) 180 0.0593 30.8%
6 Tendaho-3 (Allalobeda) 95 0.0621 29.1%
7 Aluto-1 (Langano) 75 0.0700 -
8 Abaya 790 0.0717 25.2%
9 Boseti 265 0.0721 25.0%
10 Meteka 130 0.0731 24.7%
11 Dofan 86 0.0783 23.1%
12 Tulu Moye 390 0.1037 17.0%
13 Teo 9 0.1040 17.4%
14 Fantale 120 0.1050 16.7%
15 Dallol 44 0.1076 16.6%
16 Damali 230 0.1084 16.2%
17 Nazareth 33 0.1091 16.2%
18 Boina 100 0.1111 15.8%
19 Danab 11 0.1700 9.9%
20 Arabi 7 0.1872 8.7%
- Gedemsa 37 - -
- Kone 14 - -
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Table 5.5 Prioritization Order of the Geothermal Prospects
Source: JICA Project Team
5.3 Implementation Plan
5.3.1 General Consideration
Development process of geothermal power plant before the start of generation consists of nine
stages: (i) preliminary survey, (ii) exploration, (iii) appraisal drilling and well testing, (iv) Feasibility
survey, (v) environmental impact assessment, (vi) well/power plant design, (vii) well drilling, (viii)
power station construction and (ix) start-up and commissioning. Taking into consideration the
various development status, which may allow omitting the preliminary survey and exploration,
development plans for each prospect with respect to the fastest case are discussed in the next section
based on the model case above.
5.3.2 Development Plan
Table 5.6 shows overall schedule of geothermal power development taking into account the fastest
case discussed in previous section.
RankingOrder
Geothermal SiteInstalled Capacity
(MW)
Priority-S: Committed Project COD Donor
S Tendaho-3 (Allalobeda ) 25 2017 WBS Corbetti 500 2018 RGS Aluto-1 (Langano) 70 2018 Japan/WB
S Tendaho-1 (Dubti)-Shallow reservoir 10 2018 AFD
Priority-A: Very High Economy Energy Cost (US$/kWh)
1 Tendaho-1 (Dubti)-Deep reservoir 280 0.0572 Deep reservoir
2 Aluto-2 (Finkilo) 110 0.05853 Aluto-3 (Bobesa) 50 0.05924 Tendaho-2 (Ayrobera) 180 0.05935 Tendaho-3 (Allalobeda) 95 0.0621 Expantion
Priority-B: High Economy Energy Cost (US$/kWh)
6 Abaya 790 0.0717 RG has license7 Boseti 265 0.07218 Meteka 130 0.0731
Priority-C: Low Economy Energy Cost (US$/kWh)
9 Tulu Moye 156 0.1037 RG has license10 Teo 9 0.104011 Damali 92 0.108412 Nazareth 13.2 0.109113 Boina 40 0.111114 Dofan 86 0.0783 Conflict with residents15 Dallol 44 0.1076 Difficult due to low pH
Priority-D: Less Feasible Energy Cost (US$/kWh)
16 Danab 11 0.1700 Poor access17 Arabi 2.8 0.1872 Poor accessD Gedemsa 37 - Low temperatureD Kone 14 - Low temperatureD Fantale 48 - Overlapped with national park
Remarks
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Table 5.6 Overall Schedule of Geothermal Power Development
Source: JICA Project Team
Short-term (2014–2018)
From 2015 to 2018, a total output of 610 MW from the geothermal power plants will be developed
in the short-term in this master plan.
The committed geothermal power plants and large-scale hydropower plants under construction, such
as the grand renaissance dam, are expected to generate much more electricity than the forecasted
electricity demand in the short-term. Therefore, some of other power plants generated with other
sources could be implemented in a later stage than planed in EEP master plan as explained below
Medium-term (2019–2025)
According to economic evaluation, the Priority-A and -B prospects are more economical than other
power generation schemes such as wind farms and solar power. Therefore, their development should
be prioritized over other power generation schemes in terms of least-cost power generation plan.
EEP master plan has an expected total of 1,200 MW from wind farms and solar power generation
which are not specified projects in the short-term up to 2018. The JICA Project Team would like to
propose that wind farms and solar power generation projects that are not specified should be delayed
and construction of geothermal power plants, which are mainly planned in the long-term, should be
moved forward instead.
Long-term (2026–2037)
Since most of the hydropower potential in Ethiopia is expected to be developed in the long-term and
electricity demand is forecasted to exceed 20,000 MW in the early 2030s, more geothermal potential
is anticipated to be developed. In this master plan, all geothermal potential 4,100 MW is planned to
14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37
◎
◎
◎
◎
◎
◎
◎
◎
◎
Lisenced by RG ◎
Lisenced by RG ◎
◎
◎
◎
◎
◎
◎
◎
◎
◎
◎
◎
◎
◎
◎
◎: Commencement of Operation
15
16
17
-
-
-
10
9
12
11
13
14
5
-
6
7
8
S
-
1
2
3
4
Short-term Medium-term Long-term
S
S
S
2018
-
-
total
-
3701
Sub-total
2400 -
691 -
-
0.1047
2036
-
-
0.0726
0.1019
0.1643
0.1907
0.0731
0.0971
0.0974
0.1017
0.1017
Sub-total
Sub-total -
-
-
0.0572
0.0585
0.0717
0.0592
0.0609
0.0624
0.0585
0.0720
2036
2027
2027
2029
2029
2029
2030
2030
2036
2036
44
11
7
37
14 2036
-
120
9
390
33
230
100
86
2024
110
50
180
95
500
790
265
130
2021
2021
2021
2022
2024
2024
RankingOrder
Cost ofGeneration(US$/kWh)
25 2017
500
Kone
Fantale
Year of 20**
CODInstalledCapacity
(MW)Prospect
75 2018
10 2018
Boina
Dofan
Dallol
Danab
Arabi
Gedemsa
Boseti
Meteka
Teo
Tulumoya
Nazareth
Damali
Aluto-3
Tendaho-2
Tendaho-3
Corbetti
Abaya
Tendaho-3
Corbetti
Aluto-1
Tendaho-1
Tendaho-1
Aluto-2
25 610 610
280 2020
2020
610 610 610 610 610 610 610 610 610 610 610 610 610 610 610 610 610 610 610
25 610 610 1000 1325 1825 3902 39021825 3010 3010 3010 3409 3409
2400 2400
3772 3902 3902 3902
2400 2400 2400 2400 2400 2400
3902 4091 4091
390 715 1215 1215 2400
892 892
2400 2400 2400 2400
892 1081 1081
2400
399 399 762 892 892 892
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be developed by 2037.
5.4 Financial Considerations for Geothermal Development
There will be four possible sources of funds: Word Bank ODA loans, Japan's ODA loan, commercial
banks loans and bonds issue. Their financing conditions (interest rates and repayment periods) are
summarized in Table 5.7.
Figure 5.3 shows the comparison with capital costs of each condition and existing power price
(consumer price). It is concluded that concessional public loans such as Japan’s ODA and/or WB
loans should be utilized to construct geothermal power plants.
Table 5.7 Possible Funds Loan ConditionsItem ODA-WB ODA-GOJ Commercial Banks Bonds
Interest (%) 5.0 3.0 6.0 5.0
Repayment period (year) 20 30 10 7
Source: IDA
Source: JICA Project Team (Fund procurement condition is referred to IDA)
Figure 5.3 Tariff and Production Cost using Several Funds
5.5 Implementation Structure
The energy cost of geothermal power generation shall be below the presently adopted electricity
retail tariffs under the conditions of the present energy price policy.
0.0000
0.0500
0.1000
0.1500
0.2000
0.2500
0.3000
0.3500
Tendaho-1(D
ubti)
Aluto-2 (Finkilo)
Corbetti
Aluto-3 (B
obesa)
Tendaho-2
(Ayrobera)
Tendaho-3
(Allalobeda)
Aluto-1 (L
angano)
Abaya
Boseti
Meteka
Dofan
Teo
Tulu M
oye
Fantale
Nazareth
Dam
ali
Dallol
Boina
Danab
Arabi
Tar
iff
(US
$/kW
h)
Production Costusing ODA-WB
Production Cost using Commercial
Production Cost using Bonds
Production Cost using ODA-GOJ
Domestic Tariff:2.8 cents/kWh
Export Tariff:7.0 cents/kWh
Priority -APriority -B
Priority -C
Priority -D
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A case study was conducted where four value chain models were assumed with tariff variation for
each case. Tariffs here are defined as the sales tariffs charged for the electricity generated by the
geothermal power plant at the delivery point to off-takers (Figure 5.4). With the current tariff levels,
possible and sustainable options are a fully public model for the domestic supply project, and
Models C or D for the export supply project.
Source: IFC
Figure 5.4 PPP Model Options and Tariff
The Project Team recommended establishing a new public enterprise EEGeD (Ethiopian Enterprise
for Geothermal Energy Development) by merging the geothermal relevant organizations in GES and
EEP.
Plantconstruction
Fielddevelopment
F/S &planning
Testdrilling
Exploration
PreliminarySurvey
Operation
Field Plant
Public Private
Public Private
Public Private
Public Private
Public
Public Private
Tariff($/kWh) Remarks
0.15
0.13
0.10
0.05
0.03
Corebetti
Tendaho
AlutoLangano
A
B
C
D
FullPublic
Busi
ness
Mod
el
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6. GEOPHYSICAL SURVEY
6.1 Purpose At two selected geothermal sites, the geophysical survey was conducted to contribute to the creation
and estimation of geothermal reservoir model and the planning of test drilling survey.
6.2 Selection of the Sites The master plan presented in the section 5 nominated three priority sites, Tendaho-2 (Ayrobera),
Boseti and Meteka, as green fields for development. Among those, we selected Tendaho-2
(Ayrobera) and Boseti for the geophysical survey under the master plan project. It is expected that
GSE will undertake the geophysical survey in Meteka with equipment and training provided by
JICA
6.3 Outline of Methodology At the project, MT/TEM survey was conducted. The outline of methodology is described below.
6.3.1 Survey Method MT method with far remote reference site
TEM method with central loop system(for static correction of MT data)
6.3.2 Number of stations The number of survey stations and the locations of the remote reference are given in Table 6.1.
Table 6.1 Number of survey stations and location of remote reference station
Survey site Stations location of remote reference station
Remarks
Tendaho-2 (Ayrobera) 24 Mille Adding the existing 81 stations for data analysis
Boseti 30 Koka -
Source: JICA Project Team
6.3.3 Acquired data The acquired data were as follows.
Table 6.2 Acquired data of geophysical survey Survey method Acquired data Remarks
MT method Time series data 3 components in magnetic field (Hx, Hy, Hz) 2 components in electric field (Ex, Ey)
Measurement time: more than 14 hour per one station
TEM method Transient response 1 component in magnetic field (Hz)
-
Source: JICA Project Team
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6.4 Survey results The panel diagrams of the resistivity plan map created on the basis of the results of MT/TEM survey at
Tendaho-2 (Ayrobera) site and Boseti site are shown in Figure 6.1. The resistivity structures are
described below.
6.4.1 Tendaho-2 (Ayrobera) site Generally the resistivity structure composed of three zones namely conductive overburden,
resistive zone and conductive zone at depth from surface to -5,000 m elevation. The resistivity
distribution is roughly in the range of 1 ohm-m to 250 ohm-m.
The conductive belt of NW-SE direction distributes from -700 m elevation to the deep zone and
composes the channel structure of low resistivity in the center of the site. That channel structure
shows the strike direction of the resistivity structure clearly.
The resistivity variation between the channel structure composed by the distribution of low
resistivity and the distribution of high resistivity at the outside of the channel structure is steep
and indicates resistivity discontinuity.
The channel structure of low resistivity is rather narrow in width and shows a little constriction
characteristically around profile TDO97. This characteristic suggests the resistivity
discontinuity across the channel structure.
6.4.2 Boseti site Generally the resistivity structure composed of three zones namely resistive overburden,
conductive zone and resistive zone at depth from surface to -3,000 m elevation. The resistivity
distribution is roughly in the range of 1 ohm-m to 600 ohm-m.
The distribution of the conductive belt of NNE-SSW direction continues form 500 m elevation
to the deep zone and composes the channel structure of low resistivity in the center of the site.
That channel structure shows the strike direction of the resistivity structure clearly.
The resistivity variation between the channel structure composed by the distribution of low
resistivity and the distribution of high resistivity at the outside of the channel structure is steep
and indicates the resistivity discontinuity.
The distribution of low resistivity under the highland in the northern slope of Mt. Bericha
continues from shallow zone to deeper zone. At 1,200 m elevation, the high contrast of
resistivity variation is shown around the border between this low resistivity distribution and
high resistivity distribution at the northern part and its contour lines are straight in WNW-ESE
direction and indicate the resistivity discontinuity.
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Tendaho-2 (Ayrobera) site Boseti site
(Source: JICA Project Team)
Figure 6.1 The panel diagrams of the resistivity plan maps created from MT/TEM survey results
6.5 Interpretation of Resistivity Structure in Geothermal Sites
6.5.1 Tendaho-2 (Ayrobera) Site
Figure 6.2 shows the resistivity distribution maps at different elevations, EL+200 m, EL+0 m, EL-700
m, EL-1,500 m, and EL-2,500 m. In this diagram, low resistivity zones (less than 10 ohm-m) are
remarkably dominant at EL 200 m and EL 0 m level; a low resistivity zone extending NW-SE
direction becomes apparent at El.-700 m level and downward though the distinctiveness tends to fade
out downward. The zone of NW-SE direction that is well in accordance to the general trend of the
Tendaho Graben, is considered to be an intensely fractured zone, delineated higher resistive zones
(intact rock zones) on both side of the west and the east. The fractured zone could be a reservoir
because high permeability would be expected.
For interpreting the cross sectional model, existing information are available here in Tendaho. In
Tendaho-1 (Dubti), about 13 km south-east from the site, six (6) test wells were drilled from 1994 to
1998. Among those, TD-1 and TD-2 are useful to refer. The relevant information of the two wells
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were summarized in Table 6.3. According to the table, the depth of the measured resistivity 5 ohm-m
ranges from 530 m to 580 m; whereas the depth of the measured temperature 245 – 250 oC ranges
from 450 m to 600 m. From this well corresponding relation between the depths of the resistivity and
the temperature, the depth of 5 ohm-m may be considered as the bottom of the cap layer or the top of
the reservoir in Tendaho area.
Table 6.3 Existing Test Well Data in Tendaho-1 (Dubti)
Name of Zone
TD-1 TD-2
Resistivity (Measured
depth)
Temperature (Measured
depth)
Alteration, Inferred Temp.
(Measured depth)
Resistivity (Measured
depth)
Temperature (Measured
depth)
Alteration, Inferred Temp.
(Measured depth)
1) Resistive over burden
Resistive <150 ºC Non-alteration
50-100 ºC , (95 m)
Resistive <150 ºC Non-alteration ,
50-100 ºC, (50 m)
2) Low resistive zone
<5 ohm-m, (580 m)
150 - 250 ºC, (600 m)
Argillized , 100-250 ºC,
(350 m)
<5 ohm-m (530 m)
150 º- 245 ºC
(450 m)
Argillized , 100-250 ºC,
(280 m) 3) High
resistive zone
>5 ohm-m
250 ºC Chlorite- Epidote,
250-300 ºC
>5 ohm-m
245 ºC Chlorite- Epidote,
250-300 ºC
Source: Aquator (1994) and Aquator (1995), Compiled by JICA Project Team
Figure 6.3 shows NE-SW cross section of the resistivity. In the Figure 6.3, it is apparent that a zone
of low resistivity goes down at the middle part of the analysis section. This low resistivity zone was
interpreted as a fault fracture zones that runs NW-SE direction, and the fault zone may be the
reservoir. From the Figure 6.2, it is apparent that the reservoir is capped by a low resistivity layer,
and delineated by high resistivity zones on both sides. As the layer with resistivity lower that 5
ohm-m was interpreted as cap layer (“Cap rock”), the bottom depth of the cap layer is estimated to
range from 300 m to 1,200 m on the top of the inferred reservoir. Table 6.4 summarized the
interpretation of the reservoir structure.
Table 6.4 Interpretation of MT/TEM Survey Results with Alteration Mineral Occurrence and
Temperature in Tendaho-2 (Ayrobera)
Zone Interpretation of Reservoir
Resistivity Depth (GL-m) Interpretation of Temperature 1) Resistive
overburden >10 ohm-m Less than 100 m 50-100 oC
2) Low resistivity zone
Less than 5 ohm-m
Approximately 100–500 m
100-250 oC
3) High resistive zone
>5 ohm-m (40–60 ohm-m)
Deeper than 300– 1,200 m
250-300 oC
Source: JICA Project Team
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Source: JICA Project Team
Figure 6.2 Schematic Panel Diagram of Resistivity Distribution and Interpretation in
Tendaho-2 (Ayrobera)
Basaltic Volcanic rocks and Alluvial Sediments with salt accumulation on ground
Argillized Zone (less than 5ohm-m, more than 100 oC)
Argillized
Chl-Ep
ArgillizedChl-Ep
Chl-Ep
Chl-Ep
Transition Zone between Argillized to Chrolite-Epidote Zone (boundary: 5ohm-m, Approx 250 oC)
Chl-Ep Zone(Reservoir: between 40-60 ohm-m, More than 250 oC)
Fa-2Fa-1(Surface Elevation 375m)
(GL-175m)
(GL-375m)
(GL-1075m)
(GL-1875m)
(GL-2875m)
Chl-Ep Zone(Reservoir: between 40-60 ohm-m, More than 250 oC)
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Source: JICA Project Team
Figure 6.3 Schematic Section of Tendaho-2 (Ayrobera)
6.5.2 Boseti Geothermal Site
Figure 6.4 shows the resistivity distribution maps at different elevations, EL+1,250 m, EL+1,200 m,
EL+50m, EL+0 m, EL-500 m and EL-1,000 m. In this diagram, resistivity higher than 100 ohm-m
observed at surface level is interpreted as a new lava layer. The lower resistivity zones less than 5
ohm-m are remarkably dominant at EL 500 m level: a low resistivity zone extending N-S direction
becomes apparent at EL 0 m level and downward though the distinctiveness tends to fade out
downwards. The zone is well in accordance to the faults extending to NNE-SSW direction. The low
resistivity zone therefore may be interpreted as a fault zone delineated on the both sides by resistive
zones.
Figure 6.5 shows the WNW-ESE cross section of the resistivity. In Figure 6.5, it is apparent that a
wide zone (channel) of lower resistivity goes down. The low resistivity zone was interpreted in this
figure as a fault zone running NNE-SSW direction. It is apparent that the reservoir is capped by a
low resistivity layer, and delineated by higher resistivity zones on both side. Therefore, the low
resistivity zone could be interpreted as a geothermal reservoir. It was interpreted in Tendaho that the
layer of resistivity lower that 5 ohm-m would be a cap layer (cap rock), the bottom depth of the cap
layer is estimated to range from GL-800 m to GL-900 m as shown in Figure 6.5. Table 6.5
summarized the interpretation of the inferred reservoir.
250 oC
FumaroleArea
Fa-2Fa-1
Argillized
Chl-Ep
SW NE
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Table 6.5 Interpretation of MT/TEM Survey Results with Alteration Mineral Occurrence and
Temperature in Boseti
Zone Interpretation of Reservoir Resistivity Depth (GL-m) Interpretation of Temperature
1) Resistive overburden
10–150 ohm-m Less than 300–500 m 50-100 oC
2) Low resistivity zone
Less than 5 ohm-m
Approximately 500–900 m
100-250 oC
3) High resistive zone
>5 ohm-m (25–40 ohm-m)
Deeper than 800– 900 m
250-300 oC
Source: JICA Project Team
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Source: JICA Project Team
Figure 6.4 Schematic Panel Diagram of Resistivity Distribution and Interpretation in Boseti
(Surface Elevation 1300m)
(GL-100m)
(GL-800m)
(GL-1300m)
(GL-1800m)
(GL-2300m)
Lava and Volcanic Depositswith hydrothermal alteration
Top of Argillized Zone (under 5 ohm-m, approx. 100 oC)
Middle of ArgillizedZone
Transition Zone between Argillized to Chrolite-Epidote Zone (boundary: 5 ohm-m, Approx 250 oC)
Chl-Ep Alteration Zone (as Reservoir: between 25-40 ohm-m)
Chl-Ep Alteration Zone (as Reservoir: between 25-40 ohm-m)
Chl-Ep Chl-Ep
Chl-Ep
Argillized
Chl-Ep Chl-Ep
Fb-2Fb-1
Argillized
Argillized
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Figure 6.5 Schematic Section of Boseti Geothermal Site
Argillized
Chl-Ep
100 oC
250 oC
WNW ESE
Fb-2Fb-1
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7. PROPOSAL FOR PRELIMINARY GEOTHERMAL RESERVOIR MODEL AND TARGET FOR GEOTHERMAL
TEST WELLS
7.1 Purpose
Based on the geological, geochemical and geophysical survey conducted, preliminary reservoir
model was proposed. Targets of test wells was also proposed on the basis of the proposed reservoir
models
7.2 Purpose
Based on the geological, geochemical and geophysical survey conducted, preliminary reservoir
model will be proposed in this chapter. Targets of test wells will also proposed on the basis of the
proposed reservoir models
7.3 Tendaho-2 (Ayrobera) Geothermal Site
7.2.1 Interpretation of Survey Results
Table 7.1 shows the summary and interpretation of survey results and features as topographic
features, result of geological and geochemical surveys and MT/TEM survey that is necessary for
preparing preliminary geothermal structural model in Tendaho-2 (Ayrobera) site.
Table 7.1 Summary and Interpretation of survey results and features for Geothermal
Structural Modelling
Items Features Geology Papers
Satellite Imagery Field Survey
Located at Manda-Harraro Graben. Mainly composed of basaltic lavas and pyroclastics, and sediments of Afar
Stratoid (Pliocene-Pleistocene). Recent basalt lava (Pleistocene) by fissure eruption is observed at the southwest of the survey area.
Those volcanic rocks are covered by alluvial deposit in Ayrobera. Test Well Six test wells were drilled at Tendaho-3 (Dubti) located at 9-12km south of
the site. Altered clay minerals (GL-50 to 350m), chlorite – epidote (below
GL-350m) are observed at some test wells, interpreted as cap rock and geothermal reservoir.
Test well Flow rate Temp. Depth (GL-)
TD-2 13kg/s, 46.8t/h 220℃ 890m TD-4 70kg/s, 252t/h 216℃ 250m TD-1 Very low 270℃ 880-900m
1,190-1,265m Thick sedimentary rock intercalated with basaltic rock was observed at the
depth of approx. 2,000m at TD-4 test well (located at 9km southwest of the site)
Basaltic rocks are observed below 2,000m at TD-4. Fault/ Fracture System
Papers Satellite Imagery Field Survey
The Graben is under tensile stress and NW-SE normal fault and fracture system is developed.
Spreading axis is located at the southwest of the site, and steep normal faults, dipping to the southwest, are well developed.
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Items Features Geophysical
Survey NW-SE low resistivity zone are found at the depth of GL-700m to
GL-2,500m in the center of the survey area by MT/TEM survey. According to the result of gravity survey, the above-mentioned zone is the
boundary between high-gravity area (northeast) and low-gravity area (southwest).
According to the result of magnetic survey, the above-mentioned zone is the boundary between high-magnetic intensity area (northeast) and low-magnetic intensity area (southwest). (Yohannes L.,2007)
TD-4 is located at southwest area, therefore the combination of low-gravity and low-magnetic intensity was resulted by thick sedimentary rock.
NW-SE low resistivity zone obtained by MT/TEM Survey is consistent with the boundary of other geophysical survey results, interpreted as fault zone.
Heat Source Geophysical Survey
Resistivity value is lower at the depth below 4,000m, may indicates heated zone caused by intrusion of basaltic magma.
Geothermal Fluid
Topography Satellite Imagery
Discharge is expected by Awash River and marsh zone, located at the north of the site.
Geochemical Analysis
Fumaroles of 99.3ºC were observed at the southwestern part. Result of geochemical analysis indicates 240-290ºC of geothermal fluid
temperature (by silica thermometer) Test Well Self flow of 1.8t/h (13kg/s), 220 ºC was confirmed at TD-2 Test well in
Tendaho-3 (Dubti). (DAmore et al., 1997) Cap Rock Structure
Geophysical Survey
A low resistivity zone (less than 5ohm-m) were found at the depth of GL-100m to GL-500m), may compose cap rock structure.
Test Well Altered clay minerals and zeolites are found at the depth of GL-50m to 350m in existing test wells in Tendaho-3 (Dubti).
The depth for occurrence of those minerals may be corresponded with the low resistivity zone (less than 5ohm-m).
Source: JICA Project Team
7.2 Preliminary Geothermal Reservoir Model
The Conceptual Geothermal Reservoir Model in Ayrobera, which is indicated by the above features,
is prepared. The characteristics of the model is shown in Table 7.2, diagram and section are shown in
Figure 7.1 and Figure 7.2.
Table 7.2 Characteristics of Geothermal Reservoir Item Description
Geothermal Reservoir
Geothermal reservoir may be porous basalts and sandstones. North-eastern margin of the reservoir would be clear with normal faults in basaltic rock, where south-western margin would be along many sand layers in sedimentary rocks. Altered basaltic rocks, fine sandstones and siltstones would be distributed at the top of the reservoir as cap rock.
Geothermal Fluid Geothermal fluid may be discharged by Awash River and the ground, convecting in the ground restricted by faults and fault zones. Up-flow zone would be formed along the fault zone in the center of the survey area.
Heat Source Basaltic magma is expected as a heat source in the area, which would be located at the depth of 5-6 km.
Source: JICA Project Team
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Source: JICA Project Team
Figure 7.1 Preliminary Geothermal Reservoir Model in Tendaho-2 (Ayrobera) Site
Source: JICA Project Team
Figure 7.2 Preliminary Geothermal Reservoir Model (Section) in Tendaho-2 (Ayrobera) Site
Basaltic Rock
Spreading Axis
N
2km
2km2km
Basalt dykeSedimentsBasaltFaultSpreading Axis
FumaroleCap RockReservoirFluidGeothermal FluidHeat Source
Fumaroles
CAP ROCK
NESW
Basaltic Rock
Basaltic Rock
Alluvial Deposit
Heat Source(Basaltic magma)
Geothermal Reservoir
Sedimentary Rocks
Basaltic RocksBasaltic Rocks
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7.2.3 Preliminary Target for Test Well Drilling
According to the geothermal model, a wide channel of NW-SE high temperature convective zone (low
resistivity zone) in the centre of the study area. It is expected that the drilling depth needs to be about
2,000 m to drill up to the assumed faults and high temperature convective zone. Tentative target and
specification of the test well drilling is summarized in Table 7.3 and Table 7.4. Selected drilling
locations are shown in Figure 7.3 and Figure 7.4.
Table 7.3 Tentative Target for Test Well Drilling in Tendaho-2 (Ayrobera)
Area Target Well Type AY-1 Area NW-SE subsurface normal fault zone (dipping to SW) Directional well AY-2 Area NW-SE subsurface normal fault zone (dipping to SW) Vertical Well AY-3 Area NW-SE Normal faults at Fumaroles Point (dipping to SW) Vertical Well
Source: JICA Project Team
Table 7.4 Tentative Specification of Test Well Drilling in Tendaho-2 (Ayrobera)
Item AY 1 AY 2 AY 3
Outline of the target Aiming at NW-SE low resistivity zone (Fault zone) at the centre.
Aiming at NW-SE low resistivity zone (Fault zone) at northern part.
Aiming at NW-SE Fault zone at Fumaroles point.
Location of the target from well head
Direction from True North standard : N 57°E, Vertical depth: 1,840 m Horizontal distance: 600 m
Vertical depth: 2,000 m
Vertical depth: 2,000 m
Approximate depth of the target (GL-m)
1,000–1,840 1,500-2,000 1,500–2,000
Estimated temperature at the target
Approx. 250–300 oC Approx. 250–300 oC Approx. 250–300 oC
KOP 800 m - -
Drilling depth to bottom
1,840 m 2,000 m 2,000 m
KOP :Kick-Off Point Source: JICA Project Team
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Source: JICA Project Team
Figure 7.3 Test Well Drilling Plan in Ayrobera (Tendaho-2)
Source: JICA Project Team
Figure 7.4 Schematic Section of Test Well Drilling in Ayrobera (Tendaho-2)
NESW
AY-1 AY-2AY-3
EL-1500m(GL-1800m)
GeothermalReservoir
CAP ROCK
Geothermal Reservoir
Sedimentary Rocks
Basaltic RocksBasaltic Rocks
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7.3 Boseti Geothermal Site
7.3.1 Interpretation of Survey Results
Table 7.5 shows the summary and interpretation of survey results and features as topographic
features, result of geological and geochemical surveys and MT/TEM survey that is necessary for
preparing preliminary geothermal structural model in Boseti site.
Table 7.5 Summary and Interpretation of survey results and features for Geothermal
Structural Modelling
Item Features Geology Geology Composed of basaltic-rhyolitic lava and pyroclastic rocks, and
sedimentary rocks (conglomerate-sandstone) of Nazreth Group (Pliocene-Pleistocene).
Boseti volcano and erupted lavas (obsidians), basalt lava at the surface in the northern part are classified as Wonji Group (Pleistocene), underlain by Nazreth group with unconformity.
Fault/Fracture System
Satellite Imagery Geology
Many normal faults are developed at the direction of NNE-SSW, which is concordant with the direction of Rift Valley.
Geophysical Survey
Low resistivity zone is observed at the depth of GL-800m to GL-2,300m in the center of survey area and its direction is concordant with normal faults on the ground.
Heat Source Geology According to the result of topographic analysis, lavas were intruded and erupted along the NNE-SSW fault (Fb-2) in the center of survey area (Korme et.al., 1997).
Gravity Survey
High-density rock is assumed at the depth of GL-2,000m below Boseti Volcano (D.G. Cornwell et al., 2006).
Geothermal Fluid Geochemical Analysis
Fumaroles are observed along NNE-SSW fault (Fb-1) in the survey area.
Temperature of geothermal fluid would be 170-220°C, classified as Class C (by Silica Thermometer)
Cap Rock Structure Geophysical Survey
Low resistivity zone (less than 5ohm-m) which was found at the depth of GL-800m to GL-900m is interpreted as cap rock.
Source: JICA Project team
7.3.2 Preliminary Geothermal Reservoir Model
The Conceptual Geothermal Reservoir Model in Boseti, which is indicated by the above features, is
prepared. The characteristics of the model is shown in Table 7.6, diagram and section are shown in
Figure 7.5 and Figure 7.6.
Table 7.6 Characteristics of Geothermal Reservoir Item Description
Geothermal Reservoir
Basalt-rhyolite lava and pyroclastic rocks, and sedimentary rocks along the NNE-SSW normal faults are expected as a geothermal reservoir in the area. The margin would be clearly divided by steep faults and/or fractures. Cap rock is assumed at the top of reservoir, which is mainly composed of clay layers altered from basaltic-rhyolitic rocks.
Geothermal Fluid Fluid may be discharged by the surface and aquifers in Nazreth Group. Geothermal fluid is convecting in the ground restricted by faults and fault zones. Up-flow zone would be formed along the fault zone in the center of the survey area.
Heat Source Intrusive rock(s) which may be distributed along NNE-SSW at the depth below 2,000m.
Source: JICA Project team
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Source: JICA Project Team
Figure 7.5 Preliminary Geothermal Reservoir Model in Boseti site
Source: JICA Project Team
Figure 7.6 Preliminary Geothermal Reservoir Model (Section) in Boseti site
? ?
ESEWNW
Volcanic Vent
Cap RockReservoirIntrusiveGeothermal Fluid
FumarolesFaultsFluidsVolcanic Vent
N1km
1km1km
Fb-1
Fb-2
?
Normal Fault
Boseti Volcanic Body
Normal Faults
Intrusive
CAP ROCK
Geothermal Reservoir
Basaltic/ Rhyolitic Rocks Intrusive Rock
Basaltic/ Rhyolitic Rocks
FumaroleFb-1 Fb-2
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7.3.3 Preliminary Target for Test Well Drilling
According to the geothermal model, a wide channel of NNE-SSW high temperature convective zone
(low resistivity zone) associated with two distinctive faults are observed on the ground, namely Fb-1
and Fb-2. This high-temperature zone may continue toward the south, below Boseti Volcano, and it
seems that the reservoir temperature may increase as the zone gets closer to the volcano. It is expected
that the drilling depth needs to be about 2,000 m to drill up to the assumed high temperature
convective zone with subsurface fault zones. Tentative target and specification of the test well is
proposed in Table 7.7 and Table 7.8. Selected drilling locations are shown in Figure 7.7 and Figure
7.8.
Table 7.7 Tentative Specification of Test Well Drilling in Boseti Target Area Target Test Drilling
BS-1 Area NNE-SSW low resistivity zone along Fault Fb-1 where many fumaroles are located.
Directive Well
BS-2 Area Center of the reservoir (low resistivity zone) along Fault Fb-2 near the volcanic body.
Directive Well
BS-3 Area Center of the reservoir (low resistivity zone) along Fault Fb-2 where the Fault is clearly observed on the ground.
Directive Well
Source: JICA Project Team
Table 7.8 Tentative Specification of Test Well Drilling in Boseti
Item BS-1 BS-2 BS-3 Outline of the target
Aiming at NNE-SSW low resistivity zone along Fault Fb-1.
Aiming at NNE-SSW low resistivity zone along Fault Fb-2.
Aiming at NNE-SSW low resistivity zone along Fault Fb-2.
Location of the target from wellhead
Direction from true North standard : S 30°E, Vertical depth: 1,840 m Horizontal distance: 600 m
Direction from true North standard : S30°E, Vertical depth: 1,840 m Horizontal distance: 600 m
Direction from true North standard : S30°E, Vertical depth: 1,840 m Horizontal distance: 600 m
Approximate depth of the target (GL-m)
1,000–1,840 1,000–1,840 1,000–1,840
Estimated temperature at the target
Approx. 250–300 oC Approx. 250–300 oC Approx. 250–300 oC
KOP (kick off point)
800 m 800 m 800 m
Drilling depth to bottom
1,840 m 1,840 m 1,840 m
Source: JICA Project Team
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Source: JICA Project Team
Figure 7.7 Test Well Drilling Plan in Boseti
Source: JICA Project Team
Figure 7.8 Schematic Section of Test Well Drilling in Boseti
GeothermalReservoir
? ?
ESEWNW
?
CAP ROCK
Geothermal Reservoir
Basaltic/ Rhyolitic Rocks
Intrusive Rock
Basaltic/ Rhyolitic Rocks
FumaroleFb-1 Fb-2
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8. DATABASE CONSTRUCTION
8.1 Objective and Utilization of the Database A geothermal database was constructed to systematically store various geothermal data such as
geological, geochemical, and geophysical test results as well as information on topography and
infrastructures. “G*BASE” has been produced by Geothermal Energy Research and Development
(GERD) Co. Ltd., Japan based on Oracle7/8TM exclusively for geothermal-related database.
8.2 Structure of the Database The database was constructed using the G*BASE software by digitizing all information for each
prospect. The data and information that may be input in G*BASE are summarized in Table 8.1.
Table 8.1 Database Structure of “G*BASE” Data Type Information Examples
Depth (Z, numerical data)
Well logging, lost circulation/feed point. casing program, well direction coordinates, geologic column
2D Discrete data (X, Y, numerical)
Altitude, depth to the top of rock phases, planar distributions of geophysical and geochemical survey
3D Discrete data (X, Y, X; numerical)
Geophysical survey (MT resistivity, vertical electronic sounding, etc.), reservoir simulation results
Chronological data (t; numerical)
Well test, production-reinjection well record, pressure-temp monitoring, geochemistry monitoring, etc.
Mark data Place name, manifestation point (hot spring, fumaroles), sampling point coordination, volcano
Polygon data Road, river, lake, facilities, boundary line, geological maps, faults, caldera
Image data (planar or sectional pictorial image)
Satellite imagery, geological maps, geological cross sections, seismic reflection survey, planar section at depths
Geochemical data Geochemical analysis results
Source: JICA Project Team
Instructions and training were given to the GSE staff through training in Japan and on-the-job
training in Ethiopia so that GSE is able to update the database in Ethiopia. A detailed operations
manual for G*BASE is provided to GSE in a separate volume.
8.3 Data and Information in G*BASE The JICA Project Team constructed the database and input geothermal data provided by GSE and
acquired in this study. Table 8.2 presents the list of input data and information.
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Table 8.2 Geothermal Data in G*BASE Classification Input Data
Basic Information Topographic Contour River Lake Primary Roads Railway
Geological Data Geological Map Fault Volcano Caldera
Topography (Remote Sensing Data)
Hydrothermal Alternation Circular Landform Lineament
Surface Survey Geothermal Manifestation Sampling Location
Geochemical Geochemical Analysis Result Geophysical MT/TEM Survey Map
VES Map Magnetic Sounding Map Bouguer Anomaly Map Microseismic Map
Drilling Well Data Well Location Well Curve Casing Program Geological Column Well Event (Lost circulation point)
Well Logging Data Temperature Logging Pressure Logging Well Head Pressure Test Injection Test Fall-off Test Production Test Discharge Flow Test Inference Test Build-up Test
Source: JICA Project Team
The JICA Project Team had imported into the database not only the survey results of this study but
also data collected from GSE. Using one of the applications in G*BASE, the 2-D and 3-D model
may be built that enables to construct geothermal reservoir models and to conduct fluid simulation.
8.4 Management and Upgrading of the Database It is necessary that GSE upgrade and manage the database properly when it obtains new geothermal
data. Before commencement of this study, existing geothermal data had not been utilized fully by the
GSE staff because most of the data were scattered and not accumulated properly. Moreover, there
were some missing data (including logging data, acquisition date, test conditions, and data unit, etc.).
To avoid the same mistakes, GSE is expected to accumulate all data into the G*BASE database
properly. In utilizing the database, GSE should plan further geothermal surveys and drilling
programs and simulate several tests of geothermal reservoirs and fluids.
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9. PROPOSED SURVEY UP TO TEST WELL DRILLING
We made recommendations on further surface surveys and an approach to creating the new
implementation organization EEGeD.
9.1 Recommendations on Surface Surveys in the Selected Sites
9.1.1 Target sites to be additionally surveyed
In addition to Tendaho-2 (Ayrobera) and Boseti, we proposed to include Butajira in the survey
program as a portfolio approach. Butajira was recognized as a seemingly promising site that was
accidentally identified in May 2014.
9.1.2 Approach of the additional survey
We recommend adopting a two step approach, namely, the first step for additional surface survey in the
nominated three sites, and the second step for temperature gradient well drillings as shown in Table
9.1.
Table 9.1 Proposed Additional Surface Survey and TG Wells
Capacity Building Equipment
Micro-seismicity ☑ - - -T/C,Survey equipment
Gravity Survey (Existing data) ☑ ☑ -T/C,Survey equipment
MagneticSurvey
(Existing data) ☑ ☑ Survey equipment T/C
MT/TEMSurvey ☑ - ☑ Survey equipment T/C
MT 3D Analysis ☑ - - - T/C
2m DepthTemperatureSurvey
☑ ☑ ☑ - T/C,Survey materials
Geological andGeochemicalsurvey
done done ☑- Geologist,- Geochemist
Lobo analysis T/C,Survey materials
Preliminry ESIA done done ☑ - -T/C,(out-sourcing)
2nd
TG wells
3rd Test Wells
At one or tow promising site/s
At the most promising site
- Geologists,- Geophysists,- Reservoir engineers
- Drilling service,- Drilling managers,- Geologists,- Reservoir engineers
GSE Input
Drilling machine,Supportingequipment, Drillingcrew
T/C,Drilling consumables
Step Survey Items Ayrobera Boseti
Butajira(if additionally
requested)
ESIA: Environmental, Social Impact Assessment
1st
JICA Assistance
Note: TG wells: Temperature gradient wells; T/C: Technical cooperation (Source:JICA Project Team)
two
Labo
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9.2 Proposal for on Master Plan Formulation Project on Establishment of EEGeD
9.2.1 Special Purpose Public Entity (Enterprise) The recommended new special purpose entity temporarily named as Ethiopian Enterprise for
Geothermal Energy Development (EEGeD). The mandates of EEGeD may be as follows:
To undertake the geothermal resource surface survey and test drilling,
To undertake project feasibility study when necessary for a future business of EEGeD,
To undertake field development wherever possible, and
To operate steam production and sales wherever possible.
There may be a possibility that EEGeD may extend its operation to power generation. The merits of
forming EEGeD are as follows:
EEGeD will be able to concentrate its efforts to geothermal development mainly for the purpose
of electricity generation;
EEGeD will also be able to accumulate its knowledge and experiences within the organization,
which will accelerate geothermal development; and
EEGeD, as the single focal point for geothermal development in Ethiopia, will be able to attract
donors’ attention, which will make financial arrangement much easier.
9.2.2 Characteristics of EEGeD The new geothermal-specialized public entity EEGeD shall be financially sustainable once it
becomes a fully-fledged operation. It is for this reason that EEGeD shall undertake steam production
and sales, thereby ensuring stable revenue.
9.2.3 Proposal for the Master Plan Formulation Project on Establishment of EEGeD To establish the new enterprise EEGeD, a design of institutional and regulations will be necessary.
Even though the final status of EEGeD shall be a financially sustainable organization, there will be a
transitional period when the EEGeD may need financial supports until its fully-fledged operation.
Thus, we would propose a Master Plan Formulation Project to be implemented. The proposed Terms
of Reference is shown in the Table
Table 9.2 Proposed TOR of a Master Plan Project on Establishment of EEGeD Rationale for EEGeD Vision and Mission Situation analysis
(Assessment of human, physical and financial resources) Business model
(Value chain mapping and ownership structure) Human Resource Development (Organization and staffing) Legal and regulatory framework Geothermal resource development Financial plan Steam Sales Agreement (SSA) Action Plan for Formation of EEGeD
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10. THE WAY FORWARD: CONCLUSIONS AND RECOMMENDATIONS
The Project Team assessed geothermal resources of the nominated 22 sites in Ethiopia based on
existing information, remote sensing analysis, field geological and geochemical survey followed by its
laboratory analysis, and environmental-social impact assessment. Thereby, the Team formulated the
Master Plan on Development of Geothermal Energy in Ethiopia.
Prior to describing conclusions and recommendations, we would first reconfirm and emphasize its
significances of the geothermal energy development in Ethiopia:
Geothermal power generation provides reliable electricity supply as base load throughout a
year;
Geothermal energy is supreme to other climate-dependent renewable energies such as wind,
solar and/or others;
Geothermal energy will reduce drought risks of hydropower-dependent Ethiopian power
supply;
Thus, priority has to be given to the earliest and the maximum development of geothermal
energy.
The conclusions and recommendations the Project Team reached are as follows.
10.1 Conclusions The geothermal resources of the target sites are estimated at a 4,200 MW as the most probable
occurrence probability (O/P), a 2,100 MW as 80% O/P, and a 10,800 MW as the 20% O/P. This
estimation is classified as “inferred geothermal resource” since only surface surveys were
conducted for the estimation. This estimation needs to be refined to a level of “indicated or
measured geothermal resources” through conducting geophysical survey and test well drilling
for formulating more specific development plans.
The environmental and social impact assessment identified no significant adverse impacts on
natural and social environment with a few exceptions that were eventually ranked at lower
priorities.
The 22 sites are classified into the five priority groups, i.e. Priority-S, A, B, C and D on the
basis of the multi-criteria analysis conducted. The analysis concluded that a 610 MW of the
Priority-S should be developed for the period of 2014 to 2018, an approximately 2,800 MW of
the Priority A and B for the period of 2019 to 2025, and an approximately 1,100 MW of the
Priority-C and D for the period of 2026 to 2037.
The analysis also concluded that the geothermal sites of the Priority A and B should first be
developed prior to some of the wind and solar power generating facilities planed by EEP. EEP
presently plans to install a total of an approximately 1,200 MW of wind and solar power
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facilities by 2018.
The financial analysis revealed that the generation cost could be below the present domestic
tariff level only when the Priority-A sites are developed with most concessional financing
programs such as Japan’s ODA loans; The generation cost could then be below the present
exporting tariff level when the Priority-A and B sites are developed with more concessional
financing programs such as World Bank loans; the generation cost will exceed the both tariff
levels if geothermal sites are developed with private funds. In other words, public financing
schemes shall be utilized for the geothermal development under the present tariff policy. If
private investments are to be promoted, financial and/or institutional supporting policies will
have to be established.
The geothermal development has to be implemented by a public entity who shall handle
projects with public financing schemes. A new public entity named EEGeD needs to be
established by merging the existing geothermal related sections in GSE and EEP. Financial
sustainability of EEGeD could be maintained by selling steam to the electricity producer (EEP,
etc). Private firms, however, should be allowed to participate in any stage of the geothermal
energy development.
The Project Team identified three priority sites, i.e. Tendaho-2 (Ayrobera) of Priority-A, and
Boseti and Meteka of Priority-B, from green fields where other donors or private firms have not
yet committed. Out of those three, geophysical survey was conducted in Tendaho-2 (Ayrobera)
and Boseti. Based on the geophysical survey conducted, the outer limits of geothermal reservoir
were preliminarily inferred for each site; thereby, targets of test wells were proposed.
10.2 Recommendations Geothermal power generation will be of paramount importance as stable base load energy for the
hydropower dependent Ethiopia power supply system, which is susceptible to climate change and
unstable in drought years. The Project Team proposes the following recommendations in order to
accelerate the geothermal development in Ethiopia.
To ensure the smooth implementation of the Priority-S projects that are already committed by
other donors or a private firm;
To implement, at an earliest convenient, an additional surface survey including temperature
gradient wells at Tendaho-2 (Ayrobera) and Boseti. In Butajira that was first identified in 2014,
surface survey including geophysical survey shall be conducted.
To realize, as earliest as possible after the above survey, test well drillings at Tendaho-2
(Ayrobera), Boseti or Butajira wherever deemed to be the most promising;
To conduct, as an urgent requirement, a master plan project for the establishment of EEGeD; to
implement capacity building to EEGeD, at very earliest convenient, in order to accelerate the
geothermal development; and
To review and update the geothermal resource assessment as further exploration proceeds,
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To review and update the Master Plan from time to time, since the Ethiopia economy is being
rapidly growing and the world economic circumstances are drastically changing.
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THE PROJECT FOR FORMULATING MASTER PLAN ON DEVELOPMENT OF GEOTHERMAL ENERGY IN ETHIOPIA
FINAL REPORT
APRIL 2015
Location Map
Executive Summary
Contents
Abbreviations
page CHAPTER 1 BACKGROUND OF THE PROJECT ................................................................... 1-1 1.1 Background ............................................................................................................................ 1-1 1.2 Objectives and Scope of Work of the Project ...................................................................... 1-2
1.2.1 Objectives................................................................................................................. 1-2
1.2.2 Counterpart and Relevant Organizations ................................................................. 1-2
1.2.3 Target Sites ............................................................................................................... 1-3
1.2.4 Member and Schedule of Project ............................................................................. 1-4
CHAPTER 2 ELECTRICITY DEVELOPMENT PLAN .......................................................... 2-1 2.1 Growth and Transformation Plan ........................................................................................ 2-1
2.1.1 Overview .................................................................................................................. 2-1
2.1.2 Energy Sector Plan ................................................................................................... 2-2
2.2 Overview of Power Sector ..................................................................................................... 2-3 2.2.1 Policy, Laws, Regulations, and Strategy .................................................................. 2-3
2.2.2 Power Sector Institutions ......................................................................................... 2-4
2.2.3 Power Demand Forecast .......................................................................................... 2-8
2.2.4 Power Generation Planning.................................................................................... 2-14
2.2.5 Transmission Planning ........................................................................................... 2-21
2.2.6 Financing and Tariff ............................................................................................... 2-25
2.3 Geothermal Power Development........................................................................................ 2-26 2.3.1 Existing Geothermal Development Plans .............................................................. 2-26
2.3.2 Committed Geothermal Power Development Plans............................................... 2-28
2.3.3 Target of the Geothermal Power Development ...................................................... 2-29
2.3.4 Superiority of Geothermal Power Generation ........................................................ 2-30
CHAPTER 3 GEOTHERMAL POTENTIAL SURVEY ........................................................... 3-1 3.1 Geology ................................................................................................................................... 3-1
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3.1.1 Tectonics .................................................................................................................. 3-1
3.1.2 Regional Geological Setting .................................................................................... 3-1
3.1.3 Regional Geological Structure ................................................................................. 3-2
3.2 Collection of Existing Information ....................................................................................... 3-3 3.2.1 Objective .................................................................................................................. 3-3
3.2.2 Regional Reports ...................................................................................................... 3-3
3.2.3 Detailed Geothermal Survey .................................................................................... 3-4
3.2.4 Feasibility Study ...................................................................................................... 3-4
3.2.5 Geothermal Plant Construction /Operation and Maintenance .................................. 3-5
3.3 Satellite Data Analysis ........................................................................................................... 3-5 3.3.1 Objectives................................................................................................................. 3-5
3.3.2 Methodology ............................................................................................................ 3-5
3.3.3 Results ...................................................................................................................... 3-6
3.4 Results of the Field Survey and Laboratory Analysis ........................................................ 3-8 3.4.1 Geological Survey .................................................................................................... 3-8
3.4.2 Geochemistry ......................................................................................................... 3-15
3.5 Preliminary Reservoir Assessment ..................................................................................... 3-34 3.5.1 Objectives............................................................................................................... 3-34
3.5.2 Definition of Resource and Reserve ...................................................................... 3-34
3.5.3 Methodology of Reservoir Resource Assessment – Volumetric Method ............... 3-36
3.5.4 Probabilistic Approach - Monte-Carlo Method ................................................. 3-38
3.5.5 Proposed the parameters ........................................................................................ 3-38
3.5.6 Proposal of the reservoir volumes .......................................................................... 3-38
3.5.7 Determination of Reservoir thickness .................................................................... 3-39
3.5.8 Determination of Average Reservoir Temperatures ............................................... 3-40
3.5.9 Geothermal Power Plant Type Assumed ................................................................ 3-40
3.5.10 Results of reservoir assessment .............................................................................. 3-40
(References) .......................................................................................................................... 3-44
CHAPTER 4 ENVIRONMENTAL AND SOCIAL CONSIDERATIONS ............................... 4-1 4.1 Outline of Environmental and Social Impact Assessment Study ...................................... 4-1
4.1.1 Tasks of ESIA Study ................................................................................................ 4-1
4.1.2 Objectives of ESIA Study ........................................................................................ 4-1
4.1.3 Area Covered in the ESIA Study ............................................................................. 4-2
4.2 Environmental Laws and Regulations ................................................................................. 4-2 4.2.1 Framework of environmental and social laws and regulations ................................ 4-2
4.2.2 Institutional Framework of Environmental Management in FDRE ....................... 4-10
4.3 Baseline Survey .................................................................................................................... 4-11 4.3.1 Methodology of Baseline survey ........................................................................... 4-11
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4.3.2 Outline of the Baseline data ................................................................................... 4-12
4.4 Strategic Environmental Assessment (SEA) ..................................................................... 4-15 4.4.1 Ethiopian energy policy on geothermal development ............................................ 4-15
4.4.2 Energy Resource Alternatives ................................................................................ 4-16
4.4.3 Project Alternatives ................................................................................................ 4-17
4.5 Implementation of IEE ........................................................................................................ 4-18 4.5.1 Project Categorization ............................................................................................ 4-19
4.5.2 Scoping for Initial Environmental Examination .................................................... 4-20
4.5.3 Socio-environmental Interactions .......................................................................... 4-23
4.5.4 Utilization of Water ................................................................................................ 4-24
4.5.5 Displacement and Resettlement ............................................................................. 4-25
4.6 Environmental Management Plan ..................................................................................... 4-28 4.6.1 Environmental Management Plan (EMP) .............................................................. 4-28
4.6.2 Monitoring plan ...................................................................................................... 4-29
4.7 Consultation with stakeholder ............................................................................................ 4-30 4.8 Conclusion and Recommendation ...................................................................................... 4-31
4.8.1 Conclusion ............................................................................................................. 4-31
4.8.2 Recommendation ................................................................................................... 4-32
CHAPTER 5 FORMULATION OF MASTER PLAN ............................................................... 5-1 5.1 Target and Methodology ....................................................................................................... 5-1
5.1.1 Target of the Master Plan ......................................................................................... 5-1
5.1.2 Methodology of the Master Plan .............................................................................. 5-1
5.2 Multi-Criteria Analysis for Prioritizing the Geological Prospects .................................... 5-2 5.2.1 Factors to be Considered .......................................................................................... 5-2
5.2.2 Prioritization of the Geothermal Prospects ............................................................ 5-13
5.3 Implementation Plan ........................................................................................................... 5-16 5.3.1 General Consideration ............................................................................................ 5-16
5.3.2 Development Plan .................................................................................................. 5-16
5.4 Financial Considerations for Geothermal Development .................................................. 5-20 5.5 Implementation Structure .................................................................................................. 5-22
5.5.1 Consideration of Structural Body for Geothermal Energy Development .............. 5-22
5.5.2 Special Purpose Public Entity (Enterprise) ............................................................ 5-25
5.6 On Direct Use of Geothermal Resources ........................................................................... 5-27 5.6.1 Present Status of Geothermal Resource ................................................................. 5-27
5.6.2 Proposals for Direct Uses of Geothermal Resources in Ethiopia ........................... 5-29
5.7 [REFERENCE] Models of Geothermal Power Development in International Practice ................................................................................................................................. 5-31 5.7.1 International Practice ............................................................................................. 5-31
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5.7.2 Example of Kenya .................................................................................................. 5-31
5.7.3 Example of Geothermal Development in the Philippines ...................................... 5-32
5.7.4 Example – Indonesia .............................................................................................. 5-34
CHAPTER 6 GEOPHYSICAL SURVEY ................................................................................... 6-1 6.1 Objectives ............................................................................................................................... 6-1 6.2 Selection of the Target Sites .................................................................................................. 6-1 6.3 Selection of the Target Sites .................................................................................................. 6-1 6.4 Survey Results ........................................................................................................................ 6-2
6.4.1 Tendaho 2 (Ayrobera) Geothermal Field .................................................................. 6-2
6.4.2 Boseti Geothermal Field .......................................................................................... 6-4
6.4.3 Notes for Reservoir Modelling................................................................................. 6-6
6.5 Interpretation of Resistivity Structure in Geothermal Sites ............................................ 6-12 6.5.1 Tendaho 2 (Ayrobera) Site ..................................................................................... 6-12
6.5.2 Boseti Geothermal Site .......................................................................................... 6-16
CHAPTER 7 PROPOSAL FOR PRELIMINARY GEOTHERMAL RESERVOIR MODEL AND TARGET FOR GEOTHERMAL TEST WELLS ...................... 7-1
7.1 Purpose ................................................................................................................................... 7-1 7.2 Tendaho-2 (Ayrobera) Geothermal Site............................................................................... 7-1
7.2.1 Interpretation of Survey Results............................................................................... 7-1
7.2.2 Preliminary Geothermal Reservoir Model ............................................................... 7-2
7.2.3 Preliminary Target for Test Well Drilling ................................................................. 7-4
7.3 Boseti Geothermal Site .......................................................................................................... 7-6 7.3.1 Interpretation of Survey Results............................................................................... 7-6
7.3.2 Preliminary Geothermal Reservoir Model ............................................................... 7-6
7.3.3 Preliminary Target for Test Well Drilling ................................................................. 7-8
7.4 Recalculation of Geothermal Resources and Priority of Geothermal Development ........................................................................................................................ 7-10 7.4.1 Re-evaluation of Geothermal Potential .................................................................. 7-10
7.4.2 Review of Priority of Geothermal Development ................................................... 7-10
7.5 Drilling Plan ......................................................................................................................... 7-10 7.5.1 Test Drillings .......................................................................................................... 7-10
7.5.2 Considerations for Test Drilling ............................................................................. 7-12
CHAPTER 8 DATABASE CONSTRUCTION ........................................................................... 8-1 8.1 Objective and Utilization of the Database ........................................................................... 8-1 8.2 Structure of the Database ..................................................................................................... 8-1 8.3 Data and Information in G*BASE ....................................................................................... 8-3
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8.4 Management and Upgrading of the Database..................................................................... 8-4
CHAPTER 9 PROPOSED SURVEY UP TO TEST WELL DRILLING ................................. 9-1 9.1 Recommendations on Surface Surveys in the Selected Sites ............................................. 9-1
9.1.1 Target sites to be additionally surveyed ................................................................... 9-1
9.1.2 Present development status of Butajira .................................................................... 9-1
9.1.3 Approach of the additional survey ........................................................................... 9-2
9.2 Proposal for on Master Plan Formulation Project on Establishment of EEGeD .................................................................................................................................... 9-3 9.2.1 Special Purpose Public Entity (Enterprise) .............................................................. 9-3
9.2.2 Characteristics of EEGeD ........................................................................................ 9-3
9.2.3 Proposal for the Master Plan Formulation Project on Establishment of
EEGeD ..................................................................................................................... 9-3
CHAPTER 10 THE WAY FORWARD: CONCLUSIONS AND RECOMMENDATIONS ..................................................................................... 10-1
Appendices Appendix-1: Remote Sensing Analysis
Appendix-2: Site Reconnaissance
Appendix-3: Volumetric Calculation Method
Appendix-4: Environmental and Social Impact Assessment
Appendix-5: Calculation of EIRR
Appendix-6: Geophysical Survey
Appendix-7: Database
Appendix-8: Minutes of Meeting
Appendix-9: Record photographs
Separate Volume: G*Base Operation Manual
Exchange Rate (as of April 2015)
1 USD = 116.94 JPY 1 ETB = 5.929 JPY
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Figures and Tables Figures
Figure 2.2.1 Organizational Chart of Power Sector in Ethiopia ................................................. 2-5
Figure 2.2.2 GSE Organization Chart ........................................................................................ 2-6
Figure 2.2.3 Organization Chart of Geothermal Section ............................................................ 2-6
Figure 2.2.4 EEP and EEU Organization Chart ......................................................................... 2-8
Figure 2.2.5 Electrical Sales and Number of Customers ........................................................... 2-9
Figure 2.2.6 Electrical Sales Growth by Category and Share in 2011 (GWh) ........................... 2-9
Figure 2.2.7 Energy Requirement Forecast including Exports (2012-2037) ........................... 2-13
Figure 2.2.8 Peak Demand Forecast including Exports (2012-2037) ...................................... 2-13
Figure 2.2.9 Location Map of Existing, Committed, and Proposed Hydropower Plants ......... 2-17
Figure 2.2.10 Existing and Committed Electrical Grid in Ethiopia ......................................... 2-22
Figure 2.2.11 Expansion Network Plan (left: short-term, right: long-term) ............................. 2-24
Figure 2.3.1 Installed Capacity and Reserve Margin ............................................................... 2-27
Figure 2.3.2 Energy Generation by Plant Type ........................................................................ 2-28
Figure 2.3.3 Targeted Installed Capacity of Geothermal Power Plant ..................................... 2-30
Figure 2.3.4 Composition of Electrical Supply in EEPCo Master Plan ................................... 2-31
Figure 2.3.5 Schematic Image of Electrical Supply Composition against Electricity
Demand in a day .......................................................................................... 2-31
Figure 2.3.6 CO2 Emission by Energy ..................................................................................... 2-32
Figure 3.1.1 Distribution of the African Rift Valley ................................................................... 3-1
Figure 3.1.2 Schematic Diagram for Development of the Red Sea Rift, the Aden Sea Rift,
and the Failed African Rift (MER) ................................................................ 3-2
Figure 3.4.1 SiO2-K2O+Na2O Diagram (TAS Diagram) ........................................................ 3-11
Figure 3.4.2 SiO2-K2O+Na2O Diagram in Olkaria Geothermal Field in Kenya ..................... 3-11
Figure 3.4.3 FeO-MgO-K2O+Na2O Diagram ......................................................................... 3-12
Figure 3.4.4 Distribution of geothermal manifestations in the Ethiopian Rift Valley .............. 3-20
Figure 3.4.5 Relationship between δD and δ18O of geothermal and surface waters ............... 3-24
Figure 3.4.6 Relative Cl, SO4, and HCO3 contents of geothermal and surface waters on
weight basis ................................................................................................. 3-25
Figure 3.4.7 Relative Na, K, and Mg contents of geothermal waters ...................................... 3-26
Figure 3.4.8 Comparison of temperatures calculated with geochemical thermometers for
the southwestern part of the Ethiopian Rift Valley ..................................... 3-28
Figure 3.4.9 Comparison of temperatures calculated with geochemical thermometers for
the northeastern part of the Ethiopian Rift Valley ........................................ 3-28
Figure 3.4.10 Relative He, Ar, and N2 contents of geothermal gases ...................................... 3-31
Figure 3.4.11 Relationship between 3He/4He and 4He/20Ne of geothermal gases ................. 3-32
Figure 3.4.12 Comparison of analytical results between GSE and the JICA study team ......... 3-33
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Figure 3.5.1 Relations of Geothermal Sources, and Geothermal Reserves .............................. 3-35
Figure 3.5.2 Average Reservoir Temperature and Power Plant Type ....................................... 3-40
Figure 4.2.1 Outline of Process and Procedures of EIA in Ethiopia .......................................... 4-6
Figure 5.1.1 Flow of Multi-Criteria Analysis ............................................................................. 5-2
Figure 5.2.1 Well Simulation Results ......................................................................................... 5-6
Figure 5.2.2 Generation Cost of Geothermal and Hydropower Plants....................................... 5-9
Figure 5.2.3 Generation Cost of Geothermal and Other Power Plants .................................. 5-10
Figure 5.4.1 Tariff and Production Cost using Several Funds ................................................. 5-21
Figure 5.5.1 PPP Model Options and Tariff ............................................................................. 5-23
Figure 5.5.2 PPP Models for Geothermal Development in Ethiopia ....................................... 5-25
Figure 5.6.1 Geothermal Resource Direct Use in Ethiopia ...................................................... 5-28
Figure 5.6.2 Lindal Diagram .................................................................................................... 5-29
Figure 5.7.1 (R.1) Models of Geothermal Power Development in International Practice ......... 5-31
Figure 5.7.2 (R.2) Operation Option of GDC, Kenya ................................................................ 5-32
Figure 5.7.3 (R.3) Operation Mode of PNOC EDC in the Philippines ...................................... 5-34
Figure 5.7.4 (R.4) Geothermal Development Model before Privatization in Indonesia ............ 5-35
Figure 6.4.1 The location map of MT survey ............................................................................. 6-7
Figure 6.4.2 The location map of MT stations (Ayrobera site) .................................................. 6-8
Figure 6.4.3 The location map of MT stations (Boseti site) ....................................................... 6-9
Figure 6.4.4 The panel diagram of resistivity plan maps (Ayrobera site) ................................ 6-10
Figure 6.4.5 The panel diagram of resistivity plan maps (Boseti site) ..................................... 6-11
Figure 6.5.1 General Interpretation of Resistivity Structure in relation with Alteration
Minerals Occurrence and Temperature ........................................................ 6-12
Figure 6.5.2 Schematic Panel Diagram of Resistivity Distribution and Interpretation in
Ayrobera (Tendaho-2) .................................................................................. 6-15
Figure 6.5.3 Schematic Section of Ayrobera (Tendaho-2) ....................................................... 6-16
Figure 6.5.4 Schematic Panel Diagram of Resistivity Distribution and Interpretation in
Boseti ........................................................................................................... 6-18
Figure 6.5.5 Schematic Section of Boseti Geothermal Site ..................................................... 6-19
Figure 7.2.1 Preliminary Geothermal Reservoir Model in Tendaho-2 (Ayrobera) Site ............. 7-3
Figure 7.2.2 Preliminary Geothermal Reservoir Model (Section) in Tendaho-2 (Ayrobera) Site7-3
Figure 7.2.3 Test Well Drilling Plan in Tendaho-2 (Ayrobera) ................................................... 7-5
Figure 7.2.4 Schematic Section of Test Well Drilling in Tendaho-2 (Ayrobera) ........................ 7-5
Figure 7.3.1 Preliminary Geothermal Reservoir Model in Boseti site ....................................... 7-7
Figure 7.3.2 Preliminary Geothermal Reservoir Model (Section) in Boseti site ........................ 7-7
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Figure 7.3.3 Test Well Drilling Plan in Boseti ............................................................................ 7-9
Figure 7.3.4 Schematic Section of Test Well Drilling in Boseti ................................................. 7-9
Figure 8.2.1 Startup Menu of G*BASE ..................................................................................... 8-2
Figure 8.3.1 2-D Geothermal Model (left) and 3-D Geothermal Model (right) of
the Aluto Area ................................................................................................ 8-4
Tables Table 1.2.1 Target Sites .............................................................................................................. 1-3
Table 1.2.2 Project Member ....................................................................................................... 1-4
Table 2.1.1 Growth and Transformation Plan (2010/11-2014/15) ............................................. 2-1
Table 2.1.2 GTP Targets of the Energy Sector .......................................................................... 2-2
Table 2.1.3 GTP Policy Matrix for Energy Sector .................................................................... 2-3
Table 2.2.1 Targets in the PASDEP/GTP Period 2005-2015 ..................................................... 2-4
Table 2.2.2 Electricity Sales (GWh: 2007-2012) ...................................................................... 2-9
Table 2.2.3 Generated Energy Sent out and Peak Demand (2002-2011) ................................ 2-10
Table 2.2.4 Energy Requirement Forecast in Categories (Reference Case) ............................ 2-11
Table 2.2.5 Peak Demand Forecast (Reference Case) ............................................................. 2-11
Table 2.2.6 Coincident Export Maximum Demand and Energy Forecast
(Reference Case) .......................................................................................... 2-12
Table 2.2.7 Energy Requirement and Peak Demand Forecast including Exports
(2012-2037) ................................................................................................. 2-12
Table 2.2.8 Installed Capacity of ICS and SCS, as of July 7, 2012 (2004 E.F.Y) ................... 2-15
Table 2.2.9 Power Production (GWh) ..................................................................................... 2-16
Table 2.2.10 Committed and Proposed Hydropower Plant ..................................................... 2-18
Table 2.2.11 Existing and Committed Wind Farm .................................................................. 2-19
Table 2.2.12 Candidate Sites for Solar Power Generation ...................................................... 2-19
Table 2.2.13 List of Proposed Biomass Energy Plants ............................................................ 2-20
Table 2.2.14 Proposed Waste-to-Energy Sites ......................................................................... 2-20
Table 2.2.15 List of Proposed Sugar Factories ........................................................................ 2-21
Table 2.2.16 Existing Transmission Line Length (km) ........................................................... 2-22
Table 2.2.17 Plan of New Substation and Transmission Line ................................................. 2-23
Table 2.2.18 Planned Interconnected Transmission Line ........................................................ 2-24
Table 2.2.19 Ehio-Kenya Electricity Highway Project ........................................................... 2-25
Table 2.2.20 Consumer Tariffs ................................................................................................ 2-26
Table 2.3.1 Existing Geothermal Development Plans ............................................................. 2-26
Table 2.3.2 Committed and Planned Geothermal Prospects.................................................... 2-29
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Table 3.1.1 Stratigraphy of Main Ethiopian Rift (MER) ........................................................... 3-3
Table 3.2.1 Status of Detailed Survey at Each Site .................................................................... 3-4
Table 3.4.1 Schedule of Site Survey .......................................................................................... 3-8
Table 3.4.2 Methodology of Geological Analysis ...................................................................... 3-9
Table 3.4.3 Example of Site Reconnaissance Sheet ................................................................. 3-10
Table 3.4.4 XRF Analysis Results ............................................................................................ 3-13
Table 3.4.5 Mineral Occurrence by XRD ................................................................................. 3-14
Table 3.4.6 Summary of the site reconnaissance in the southwestern part of the Ethiopian
Rift Valley .................................................................................................... 3-16
Table 3.4.7 Summary of the site reconnaissance in the northeastern part of the Ethiopian
Rift Valley .................................................................................................... 3-17
Table 3.4.8 Analytical components .......................................................................................... 3-19
Table 3.4.9 Analytical methods ................................................................................................ 3-19
Table 3.4.10 Results of chemical and isotopic analysis for water samples .............................. 3-22
Table 3.4.11 Results of chemical and isotopic analysis for gas samples .................................. 3-23
Table 3.4.12 Calculated results of geochemical thermometers for geothermal waters ............ 3-27
Table 3.4.13 Calculated results of geochemical thermometers for geothermal gases .............. 3-29
Table 3.4.14 Estimation of ranges of reservoir temperature for a volumetric method ............. 3-30
Table 3.5.1 Comparison Between Eight Stages and AGRCC’s Categories ............................. 3-35
Table 3.5.2 Parameters for reservoir assessment ...................................................................... 3-38
Table 3.5.3 Determination of Plane Area of Geothermal Reservoir ......................................... 3-39
Table 3.5.4 Determination of Geothermal Reservoir Thickness .............................................. 3-39
Table 3.5.5 Average Reservoir Temperatures ........................................................................... 3-40
Table 3.5.6 Resource assessment ............................................................................................. 3-41
Table 3.5.7 Comparison of the results of the Prevailing method and Proposed method .......... 3-42
Table 3.5.8 Parameters Used for Reservoir Resource Assessment .......................................... 3-43
Table 4.1.1 The Target Sites ....................................................................................................... 4-2
Table 4.2.1 Major Regulations, Guidelines and Proclamations Applicable to
the Geothermal Energy Development Project ............................................... 4-3
Table 4.2.2 Draft Standards for Industrial Emission and Effluent Limits (Ethiopian EPA) ....... 4-7
Table 4.2.3 Draft Standards for Ambient Air Condition (Ethiopian EPA) ................................. 4-7
Table 4.2.4 National Noise Standard at Noise Sensitive Areas(Note) ....................................... 4-7
Table 4.2.5 EHS Guidelines for Emission Gas .......................................................................... 4-8
Table 4.2.6 EHS Guidelines for Effluent ................................................................................... 4-8
Table 4.3.1 Profile of Three Regions ....................................................................................... 4-12
Table 4.3.2 Natural, Historical and Cultural Heritages ............................................................ 4-14
Table 4.3.3 Distribution of sensitive environmental features surrounding the project ............. 4-14
Table 4.4.1 Environmental Characteristics of Geothermal Energy .......................................... 4-17
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Table 4.4.2 Advantages of Geothermal Energy........................................................................ 4-17
Table 4.4.3 Comparison of Alternative .................................................................................... 4-18
Table 4.5.1 Environmental Categorization of Projects ............................................................. 4-19
Table 4.5.2 Environmental Scoping Checklist for the Project for Formulating Master Plan
on Development of Geothermal Energy in Ethiopia project ........................ 4-21
Table 4.5.3 Livelihood at the prospective sites ........................................................................ 4-23
Table 4.5.4 Statuses of Water Access in 15 Prospective Sites .................................................. 4-25
Table 4.5.5 Displacement and Resettlement/Land claim ......................................................... 4-25
Table 4.6.1 Mitigation Measures for EMP ............................................................................... 4-28
Table 4.6.2 Monitoring Plan for Geothermal Energy Development Project ............................ 4-29
Table 5.1.1 Development Target of the Master Plan .................................................................. 5-1
Table 5.2.1 Development Status and Geothermal Resource ...................................................... 5-3
Table 5.2.2 Economic Life ......................................................................................................... 5-5
Table 5.2.3 Plant Factor.............................................................................................................. 5-5
Table 5.2.4 Generation Costs of Candidate Hydropower Plants ................................................ 5-5
Table 5.2.5 Generation Costs of Non-Hydro and Non-Geothermal Plants ................................ 5-6
Table 5.2.6 Generation Costs of Geothermal Power Plants ....................................................... 5-8
Table 5.2.7 Ranking Order of the Geothermal Prospects ........................................................... 5-8
Table 5.2.8 Basic Assumptions Used for Economic Evaluation of Tendaho-2 (Ayrobera) ...... 5-11
Table 5.2.9 Ranking of Geothermal Power Plants and EIRR................................................... 5-11
Table 5.2.10 Required Length and Voltage of Transmission Line ........................................... 5-12
Table 5.2.11 Required Length and Topography of Access Road.............................................. 5-13
Table 5.2.12 Prioritization Order of the Geothermal Prospects ............................................... 5-14
Table 5.3.1 Simplified Geothermal Development Period ........................................................ 5-16
Table 5.3.2 Overall Schedule of Geothermal Power Development .......................................... 5-17
Table 5.3.3 Short-term Development Plan ............................................................................... 5-18
Table 5.3.4 Middle-term Development Plan ............................................................................ 5-19
Table 5.3.5 Long-term Development Plan ............................................................................... 5-20
Table 5.4.1 Possible Funds Loan Conditions ........................................................................... 5-21
Table 5.6.1 Present Status of Geothermal Direct Uses in the World and in Japan ................... 5-27
Table 5.6.2 Geothermal Direst Use .......................................................................................... 5-27
Table 5.6.3 Proposals for Direct Uses of Geothermal Resources in Ethiopia .......................... 5-30
Table 5.7.1 (R.1) Geothermal Power Stations Operational in Indonesia (as of 2015) ............... 5-36
Table 6.4.1 Summary of MT/TEM Survey at Boseti ................................................................. 6-5
Table 6.5.1 General Interpretation of Resistivity Structure in relation with Alteration
Mineral Occurrence and Temperature .......................................................... 6-12
Table 6.5.2 Existing Test Well Data in Dubti (Tendaho-1) ....................................................... 6-13
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Table 6.5.3 Interpretation of MT/TEM Survey Results with Alteration Mineral
Occurrence and Temperature in Tendaho-2 (Ayrobera) ............................... 6-14
Table 6.5.4 Interpretation of MT/TEM Survey Results with Alteration Mineral
Occurrence and Temperature in Boseti ........................................................ 6-17
Table 7.2.1 Summary and Interpretation of survey results and features for Geothermal Structural
Modeling ........................................................................................................ 7-1
Table 7.2.2 Characteristics of Geothermal Reservoir ................................................................... 7-2
Table 7.2.3 Tentative Target for Test Well Drilling in Tendaho-2 (Ayrobera) ............................ 7-4
Table 7.2.4 Tentative Specification of Test Well Drilling in Tendaho-2 (Ayrobera) .................. 7-4
Table 7.3.1 Summary and Interpretation of survey results and features for Geothermal Structural
Modeling ........................................................................................................ 7-6
Table 7.3.2 Characteristics of Geothermal Reservoir ................................................................. 7-6
Table 7.3.3 Tentative Specification of Test Well Drilling in Boseti ........................................... 7-8
Table 7.3.4 Tentative Specification of Test Well Drilling in Boseti ........................................... 7-8
Table 7.4.1 Reservoir Volume Estimated by Geothermal Conceptual Model .......................... 7-10
Table 7.4.2 Geothermal Potential Recalculated by Reservoir Volume ..................................... 7-10
Table 7.5.1 Types of Test Drilling ............................................................................................ 7-11
Table 8.2.1 Database Structure of “G*BASE” ........................................................................... 8-1
Table 8.2.2 Prospect IDs in G*BASE ........................................................................................ 8-2
Table 8.3.1 Geothermal Data in G*BASE ................................................................................. 8-3
Table 9.1.1 Proposed Additional Surface Survey and TG Wells ................................................ 9-2
Table 9.2.1 Proposed TOR of a Master Plan Project on Establishment of EEGeD ................... 9-4
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Abbreviations
AFD French Development Agency
AfDB African Development Bank
AGRCC Australian Geothermal Energy Group Geothermal Code Committee
ARGeo African Rift Geothermal Development Facility
ASTER Advanced Spaceborne Thermal Emission and Reflection Radiometer
AUC Africa Union Commission
BGR Bundesanstalt für Geowissenschaften und Rohstoffe
CCGT Combined Cycle Gas Turbine
COD Commercial Operation Date
EAPP Eastern African Power Pool
EEA Ethiopian Energy Agency
EELPA Ethiopian Electric Light and Power Authority
EEP Ethiopian Electric Power
EEPCo Ethiopian Electric Power Corporation
EEU Ethiopian Electric Utility
EG Ethylene Glycol
EIA Environmental Impact Assessment
EIRR Economic Internal Rate of Return
EPA Environmental Protection Authority
ESIA Environmental and Social Impact Assessment
ESMF Environment and Social Management Framework
FS, F/S Feasibility Study
GHI Global Horizontal Irradiance
GIS Geographical Information System
GPS Global Positioning System
GRMF Geothermal Risk Mitigation Facility for Eastern Africa
GSE Geological Survey of Ethiopia
GSDP Geothermal Development Project
GTP Growth and Transformation Plan
HVAC high voltage alternate current
HVDC high voltage direct current
IAEA International Atomic Energy Agency
ICEIDA Iceland International Development Agency
ICS Inter-Connected System
IDA International Development Agency
IEE Initial Environmental Examination
IFC International Finance Corporation
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IPP Independent Power Producer
JCC Joint Coordination Committee
JICA Japan International Cooperation Agency
KfW Kreditanstalt für Wiederaufbau
Ma Million age
MCA Multi-Criteria Analysis
MER Main Ethiopian Rift
MoM Ministry of Mines
MoFED Ministry of Finance and Economic Development
MoWIE Ministry of Water, Irrigation and Energy
MP, M/P Master Plan
MT Magneto-Telluric Method
NDF Nordic Development Fund
PALSAR Phased Array type L-band Synthetic Aperture Radar
PASDEP Plan for Accelerated and Sustainable Development to End Poverty
PPA Power Purchase Agreement
RG Reykjavik Geothermal
SCS Self-Contained System
SEA Strategic Environment Assessment
SREP Scaling up Renewable Energy Program
SWIR Short Wave Infrared Radiometer
TBD To be decided
TEM Transit Electro-Magnetic Method
TICAD Tokyo International Conference on African Development
TIR Thermal Infrared Radiometer
UEAP Universal Electricity Access Program
UNDP United Nations Development Programme
UNEP United Nations Environment Programme
USAID US Agency for International Development
VNIR Visible and Near-infrared Radiometer
WB The World Bank
WFB Wonji Fault Belt
XRD X-Ray Diffraction
XRF X-Ray Fluorescence
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CHAPTER 1 BACKGROUND
1.1 Background The total installed capacity of electricity power plants in Ethiopia amounted to 2,100 MWe, as of
January 2010; more than 90% of such are of hydropower. Ethiopia intends to develop its huge
hydropower potential, estimated to be up to 45,000 MWe in the country, to satisfy the increasing
national demand as well as to export surplus electricity to surrounding countries.
However, yearly fluctuation of precipitation has become larger possibly due to global climate change,
which has aggravated the reliability of hydropower electricity generation. Economic and industrial
activities in the country are to be affected by the unexpected fluctuation of power supply that presently
depends heavily on hydropower.
Under such circumstances, the Ethiopia Electricity Power Cooperation (EEPCo) addresses the
development of indigenous energy such as geothermal and/or wind power, with recognition of the
importance of energy diversity and energy mixture.
Among other indigenous types of energy, geothermal energy has become more important as a base
load power, as well as the following: i) a substitute to fossil fuel being imported, ii) a major backup to
hydropower electricity supply, iii) a service to arid and semi-arid areas in the country where
hydropower is unavailable, and iv) contribution to the United Nations Framework Convention on
Climate Change (UNFCCC) effort of reducing global warming.
Geothermal potential survey was commenced in Ethiopia in 1969. Since then, step-by-step potential
surveys have identified more than 16 promising geothermal sites for electricity development. The total
geothermal potential is estimated at 5,000 MWe.
However, development stages of the sites vary (only two sites, i.e., Aluto-Langano site and Corbetti
site, are being developed towards commercial operation, whereas there are sites where development
has been suspended, as follows: i) after test well drillings (Tendaho-1 (Dubti) site and Gedemsa site),
ii) after slim hole drillings; and iii) after surface geological and geochemical surveys. Under this
condition, a priority comparison with reasonable datasets is required for geothermal development.
The Geological Survey of Ethiopia (GSE) requested the Government of Japan for technical assistance
in formulating a master plan for geothermal development including geothermal potential evaluation
and prioritization, and technical capacity building for geothermal development. In response to the
request, the Japan International Cooperation Agency (hereinafter referred to as “JICA”) conducted a
preparatory survey for survey planning in February 2013, that resulted in the Records of Discussion
(R/D) with Ethiopia for the implementation of “The Project for Formulating Master Plan on
Development of Geothermal Energy in Ethiopia” (hereunder referred to as “the Project”).
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Based on the R/D, JICA dispatched the JICA Project Team headed by Mr. TAKAHASHI Shinya of
Nippon Koei Co., Ltd., Japan to conduct the Project.
1.2 Objectives and Scope of Work of the Project
1.2.1 Objectives
The objectives of the Project are as follows:
1) To conduct geothermal surface survey for 161 geothermal prospects;
2) To prioritize geothermal prospects with a unique set of criteria with database construction;
3) To formulate the master plan for geothermal development based on the above; and
4) To contribute to capacity development of GSE under the process of formulating the master plan.
1.2.2 Counterpart and Relevant Organizations
The counterpart organization and the Joint Coordination Committee are as follows:
1) Counterpart:
Geological Survey of Ethiopia (GSE), Ministry of Mines of Ethiopia
2) Joint Coordination Committee (JCC)
i) Ethiopian Organizations
Director General of GSE / Chief Geologist of GSE
Director of Geothermal Resource Directorate, GSE
Representative from the Ministry of Mines (MoM)
Representative from the Ministry of Water, Irrigation and Energy (MoWIE)
Representative from the Ethiopian Electric Power (EEP)
Representative from the Ministry of Finance and Economic Development (MoFED)
ii) Japanese Organizations
Resident Representative of JICA Ethiopia Office
JICA Project Team
Other personnel concerned to be proposed by JICA
1 According to R/D (11 June 2013)
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iii) Observer
Representative from the Embassy of Japan
Note that EEPCo has been restructured into two companies: a) Ethiopia Electric Power
(EEP) responsible for power generation and supply, and b) Ethiopian Electric Utility (EEU) for
delivering electricity services (transmission, distribution, and sale of electric power). The EEP will be
managed by the Ethiopian CEO, whereas the EEU will be managed for two years by an Indian
company (Power Grid Corporation).
1.2.3 Target Sites
The target sites are listed in Table 1.2.1 below. The approximate locations are shown in the location
map at the beginning of this report.
Table 1.2.1 Target Sites
Geothermal Sites Prioritization /
Data base Remote Sensing
Site Survey
1 Dallol ☑ ☑ GSE 2 Tendaho-3 (Tendaho-Allalobeda) ☑ ☑ ☑ 3 Boina ☑ ☑ GSE 4 Damali ☑ ☑ GSE 5 Teo ☑ ☑ GSE 6 Danab ☑ ☑ GSE 7 Meteka ☑ ☑ ☑ 8 Arabi ☑ ☑ GSE 9 Dofan ☑ ☑ ☑ 10 Kone ☑ ☑ ☑ 11 Nazareth ☑ ☑ ☑ 12 Gedemsa ☑ ☑ ☑ 13 Tulu Moye ☑ ☑ - 14 Aluto-2 (Aluto-Finkilo) ☑ ☑ ☑ 15 Aluto-3(Aluto-Bobesa) ☑ ☑ ☑ 16 Abaya ☑ ☑ - (17) Fantale ☑ ☑ - (18) Boseti ☑ ☑ ☑ (19) Corbetti ☑ ☑ - (20) Aluto-1 (Aluto-Langano) ☑ ☑ - (21) Tendaho-1 (Tendaho-Dubti) ☑ ☑ - (22) Tendaho-2 (Tendaho-Ayrobera) ☑ ☑ ☑
Source: JICA Project Team
☑:Target for the M/P formulation project GSE: The sites where GSE should undertake the site survey due to access and/or security issues. Source: Proposed by the JICA Project Team based on the R/D (11 June 2013) and subsequent discussions between GSE and the JICA Project Team
Among the 22 sites listed above, sites #01 to #16 are included in the R/D (11 June 2013), while sites
#17 to #22 are newly included in the Master Plan Formulation Project, as a result of the inception
report meeting held on 14 October 2013 at the GSE head office and other follow-up meetings.
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1.2.4 Member and Schedule of Project
Member list of this project is shown in Table 1.2.2.
Table 1.2.2 Project Member
Name Position Company
Shinya TAKAHASHI Team Leader / Geothermal Development Nippon Koei Co., Ltd.
Toshiaki HOSODA Acting Team Leader / Geology Nippon Koei Co., Ltd.
Tsukasa YOSHIMURA Geothermal Reservoir Evaluation Nippon Koei Co., Ltd.
Daisuke FUKUDA Geochemistry JMC Geothermal Engineering Co., Ltd.
Naoki KAWAHARA Electric Power Development / Database Nippon Koei Co., Ltd.
Nobuhiro MORI Economic Analysis Nippon Koei Co., Ltd. (KRI International Corp.)
Shinsuke SATO Socio-Environmental Assessment Nippon Koei Co., Ltd.
Masahiro TAKEDA Geophysical Survey-1 Sumiko Resources Exploration & Development Co., Ltd
Akira KIKUCHI Geophysical Survey-2 Sumiko Resources Exploration & Development Co., Ltd
Yasushi MOMOSE Donor Coordination-1 / Geothermal Reservoir Evaluation-2
Nippon Koei Co., Ltd.
Masako TERAMOTO Donor Coordination-1 / Geochemistry -2 Nippon Koei Co., Ltd.
Source: JICA Project Team
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CHAPTER 2 ELECTRICITY DEVELOPMENT PLAN
2.1 Growth and Transformation Plan
2.1.1 Overview
The latest government development plan is the Five-year Growth and Transformation Plan (GTP) for
the period 2010/11-2014/15. The GTP has been prepared with clear objectives and targets through
wide public participation at both the federal and regional levels. The Council of Ministers and the
House of People’s Representative have adopted the GTP as the national planning document of the
country for the period 2010/11-2014/15. The GTP’s main objectives, strategies, and targets are clearly
set out in the document. During the GTP period, special emphasis will be given to agricultural and
rural development, industry, infrastructure, social and human development, good governance, and
democratization.
The Ministry of Finance and Economic Development is responsible for preparing, implementing, and
monitoring the GTP. The visions, objectives, and strategic pillars are summarized in Table 2.1.1.
Development programs that will be implemented in the five-year GTP period will have a strong focus
on improving the quality of public services provided. Thus, special emphasis is given to investments in
infrastructure and in the social and human development sectors. It is clear that implementation of the
GTP will require mobilization of considerable financial and human resources, especially for
infrastructure development. For this reason, mobilization of domestic financial and human resources,
as well as improvements in domestic savings, are considered to be critical.
Table 2.1.1 Growth and Transformation Plan (2010/11-2014/15)
Factor Description Ethiopia’s vision guiding the GTP
“to become a country where democratic rule, good governance, and social justice reign upon the involvement and free will of its peoples, and once extricating itself from poverty to reach the level of a middle-income economy as of 2020-2023.”
Vision on economic sectors “building an economy which has a modern and productive agricultural sector with enhanced technology and an industrial sector that plays a leading role in the economy, sustaining economic development and securing social justice and increasing per capita income of the citizens so as to reach the level of those in middle-income countries.”
Objectives 1. Maintain at least an average real gross domestic product (GDP) growth rate of 11% and attain the millennium development goals (MDGs); 2. Expand and ensure the qualities of education and health services and achieve MDGs in the social sector; 3. Establish suitable conditions for sustainable nation building through the creation of a stable democratic and development state; and 4. Ensure the sustainability of growth by realizing all the above objectives within a stable macroeconomic framework.
Strategic pillars 1. Sustaining rapid and equitable economic growth, 2. Maintaining agriculture as major source of economic growth, 3. Creating conditions for the industry to play key role in the economy, 4. Enhancing expansion and quality of infrastructure development, 5. Enhancing expansion and quality of social development, 6. Building capacity and deepen good governance, and 7. Promote gender and youth empowerment and equity.
Source: GTP (2010/11-2014/15)
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2.1.2 Energy Sector Plan
The strategic directions of the energy sector are development of renewable energy, expansion of
energy infrastructure, and creation of an institutional capacity that can effectively and efficiently
manage such energy sources and infrastructure. During the GTP period, the gap between the demand
for and supply of electricity will be minimized.
The main objective of the energy sector is to meet the demand for energy in the country by providing
sufficient and reliable power supply that meets international standards at all time. This objective will
be achieved by accelerating and completing the construction of new hydropower plants, as well as
geothermal plants, and strengthening the existing transmission lines to provide improved access to
rural villages all over the country. An additional objective is to export power to the neighboring
countries. Modernizing the distribution system will also be considered to reduce power losses.
The main targets of the energy sector are summarized in Table 2.1.2.
Table 2.1.2 GTP Targets of the Energy Sector
Description of Target 2009/10 2014/15
1. Hydroelectric power generating capacity (MW) 2,000 10,000
2. Total length of distribution lines (Km) 126,038 258,000
3. Total length of rehabilitated distribution lines (Km) 450 8,130
4. Reduce power wastage (%) 11.5 5.6
5. Number of consumers with access to electricity 2,000,000 4,000,000
6. Coverage of electricity services (%) 41 75
7. Total underground power distribution system (Km) 97 150
Source: GTP (2010/11-2014/15)
The implementation strategies for power generation and transmission are set out as follows:
For power generation: Ethiopia has a potential to generate 45,000 MW of hydroelectric power and
5,000 MW of geothermal power. However, currently only 2,000 MW has been developed. It is planned
to increase this level of generated power by four times. The implementation strategies are: (i) to
promote a best mix of energy sources by developing hydro, geothermal, and other renewable energies
including wind and solar power; (ii) to prevent power losses and promote proper utilization of energy;
(iii) to reduce unit costs of power generation investments and operations; and (iv) to provide electricity
at affordable prices.
For power transmission: To ensure a reliable electricity supply and transmit the electric power
efficiently and economically to consumers, construction of a reliable transmission and distribution
networks is essential. To this end, due emphasis will be given in the Universal Electrification Access
Program to construct new transmission lines and connect them to the national grid as economically as
possible and to reduce power losses.
The GTP policy matrix for the energy sector, which stipulates who will do what by when and will be
verified by how, is set out as follows:
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Table 2.1.3 GTP Policy Matrix for Energy Sector
MoWIE: Ministry of Water, Irrigation, and Energy
Source: GTP (2010/11-2014/15) (modified by the JICA Project Team)
2.2 Overview of Power Sector
2.2.1 Policy, Laws, Regulations, and Strategy
The Transitional Government of Ethiopia released its first National Energy Policy in March 1994. This
is still in force as the policy of the Government of Ethiopia and is currently being revised. It aims to
address household energy problems by promoting agro-forestry, increasing the efficiency with which
biomass fuels are utilized, and facilitating the shift to greater use of modern fuels. Furthermore, the
policy states that the country will rely mainly on hydropower to increase its electricity supply, and also
take advantage of geothermal, solar, wind, and other renewable energy resources, where appropriate. It
also refers to the need to encourage energy conservation in the industry, transport, and other major
energy-consuming sectors, to ensure that energy development is economically and environmentally
sustainable.
The Plan for Accelerated and Sustained Development to End Poverty (PASDEP) was presented as a
five-year (2005/06-2009/10) development strategy by the Government of Ethiopia in 2006, which
aims to become a middle income country in 20-30 years. The PASDEP had set its target in the energy
sector to increase the access rate from 16% (2005/06) to 50% (2009/10) by the augmentation of energy
generation from 791 MW to 2,218 MW and the expansion of the grid to 13,054 km. Energy loss was
also planned to be reduced from the current level of 19.5% to the international average of 13.5%
during the PASDEP period. The total cost for these plans was estimated to be ETB 51 billion
(equivalent to USD 5.3 billion) for five years which was almost equal to the annual national budget.
Base year Implementing Means of(2009/10) 10/11 11/12 12/13 13/14 14/15 Agency Verification
Increased in electricpower users
Number of consumers with access toelectricity (in million)
2.03 2.13 2.33 3.70 3.30 4.00
Increased in electricpower distribution
Coverage of electricity services (%) 41 50 55 65 70 75
Total length of distribution lines (Km) 126,038 1E+05 1E+05 2E+05 2E+05 3E+05
Total length of rehabilitated distributionlines (Km)
450 967 3,258 5,694 8,130 8,130
reduce power wastage of powertransmission lines (%)
11.0 10.8 8.5 5.6 5.6 5.6
Total underground power distributionsystem (Km)
97 53
High voltage (500 kV) electric grid lineconstructed (Km)
434 434 434
High voltage (400 kV) electric grid lineconstructed (Km)
710 710 714 1,082 1,377 1,377
Voltage grid lines with 230, 132, 66 kVconstructed (Km)
10,730 11,397 12,954 13,604 14,404 15,189
Proportion of rehabilitated distribution sub-stations (%)
50 100
Reduce power wastage of powertransmission and distribution sub-stations
5.34 4.5 4.0 4.0 4.0 3.0
Power generating capacity (MW) 2,000 2,045 2,582 3,117 5,054 10,000
Electric power produced (GWh) 7,653 7,923 10,576 12,140 19,234 32,656
Increased electricpower generationand production
Increased in generationand produced electricpower
MoWIEMoWIEannualreport
MoWIE MoWIEannualreport
Modernizing thedistribution andtransmissionsystem, so as toreduce powerlosses tointernationalbenchmark levels
Increased inconstructed electricsub-stations andgridlines their quality
MoWIEMoWIEannualreport
Objective Output IndicatorAnnual Targets (20**/**)
Increase qualityelectric powersupply servicecoverage
Increased inconstruction of electricdistribution station
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Following PASDEP, the GTP mentioned in Section 2.1 is the current national policy for the period
2010/11 – 2014/15 and has targets for energy sector to increase the installed capacity by 8,000 MW of
renewable energy resources. Table 2.2.1 presents the targets of PASDEP and GTP.
Table 2.2.1 Targets in the PASDEP/GTP Period 2005-2015
Item 2005/06 PASDEP
2005/06-2009/10 2012
GTP 2010/11-2014/15
Installed Capacity 791MW 2,218 MW (+1,427MW) 2,168 MW 10,000 MW Electrification Rate 16% 50% (+34%) 17% 75% Length of Transmission/Distribution Line
- 13,054km 12,461 km 258,000 km
Electricity Loss 19.5% 13.5% - 5.6%
Source: PASDEP/GTP (summarized by the JICA Project Team)
The Ethiopian Electric Power Corporation (EEPCo), which was the national electricity utility and in
charge of power generation plan, completed the “Ethiopian Power System Expansion Master Plan” in
February 2014. The objective of the study is to update the least cost Power System Expansion Program
for the development of Ethiopia's generation and transmission systems for the next 25 years
(2013–2037).
Based on the national policies above new hydropower plants have been commissioned and a number
of power plants using renewable energy resource has been committed for construction in the next ten
years. The Prime Minister of Ethiopia, Hailemariam Desalegn, also mentioned the necessity of
Africa’s transformation and enhanced the importance of energy development in his speech given on 29
September 2013 in New York. He also stated that Ethiopia will develop around 80,000 MW of hydro,
geothermal, wind, and solar power over the next 30 years, not just for Ethiopia, but for neighboring
countries as well.
On the other hand, the Government of Japan agreed to the Yokohama Declaration 2013 that prioritizes
investment promotion for renewable energy including hydro, solar, and geothermal, in the Fifth Tokyo
International Conference on African Development (TICAD V) held on 3 June 2013. And also Japan’s
Prime Minister, Shinto Abe, expressed his intention to resume the Japanese Yen Loan and conveyed
his expectation that its first project would be the expansion of Aluto-Langano Geothermal Power Plant.
He also expressed his interest in the development potential of geothermal energy in Ethiopia.
2.2.2 Power Sector Institutions
The power sector is managed by the national government. There are five major institutions engaging
in the sector, namely: (i) Ministry of Mines (MoM), (ii) Geological Survey of Ethiopia (GSE), (iii)
Ministry of Water, Irrigation and Energy (MoWIE), (iv) Ethiopian Electric Power (EEP) and Ethiopian
Power Utility (EEU), and (v) Independent Power Producers (IPPs). Functionality-wise, the MoM and
MoWIE undertake policy-making and regulation while GSE conducts geothermal exploration and EEP,
EEU, and IPPs undertake construction and operation of power supply system (generation and
transmission and distribution) as shown in Figure 2.2.1.
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Source: JICA Project Team
Figure 2.2.1 Organizational Chart of Power Sector in Ethiopia
(1) Geological Survey of Ethiopia (GSE)
GSE is responsible for geothermal exploration as part of the mineral exploration of the country. GSE
was established under the Ministry of Mines and has been involved in geothermal exploration since
the work started with reconnaissance surveys in the Ethiopian Rift Valley between 1969 and 1973
funded by the United Nations Development Programme (UNDP). It is currently responsible for all
scientific exploration works including the drilling and testing of wells. EEP then takes over the power
station construction and operation. This is the model used for the development of the Aluto- Langano
and Tendaho fields.
Figure 2.2.2 and Figure 2.2.3 shows organization chart of GSE and Geothermal Resource Exploration
& Assessment Directorate. GSE has eight technical sections, which are managed by the chief geologist
under the director general. Geothermal Resource Exploration & Assessment Directorate has
responsibility about geothermal resource exploration in GSE.
Ethiopian Pow
er C
orporation (EE
PCo)
Geological Survey of Ethiopia(GSE)
Ministry of Water, Irrigation and Energy (MoWIE)
Ethiopian Energy Agency (EEA)
Ethiopian Electric Utility (EEU)
Policy and Regulation
Generation and Transmission
Distribution and Supply
Production Right
Development Right
Power Purchase Agreement (PPA) IPPs
Export
Prospecting Right
Exploration Right
Ethiopian Electric Power (EEP)
Split in Feb. 2014
Ministry of Mines (MoM)
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Source: GSE
Figure 2.2.2 GSE Organization Chart
Source: GSE
Figure 2.2.3 Organization Chart of Geothermal Section
(2) Ministry of Mines (MoM)
MoM is the ministry responsible for geothermal development in Ethiopia through GSE headed by its
Director General. There is no staff at the ministry dealing specifically with geothermal activities.
(3) Ministry of Water, Irrigation and Energy (MoWIE)
MoWIE is the responsible organization of the Government of Ethiopia that is responsible for the
country’s energy sector development and expansion. MoWIE has two sections, namely: energy section
and water supply section and the energy section has six divisions and has jurisdiction over Ethiopian
Energy Agency (EEA), Ethiopian Electric Power (EEP) and Ethiopian Electric Utility (EEU). Energy
related directorates within MoWIE are responsible for energy policy drafting, implementation follow
up and supervision. They are also responsible for conducting research and studies including
development and promotion of rural energy-efficient technologies.
Director General
Human ResourceManagement & Development
Support Directorate
Planning, Monitoring & Evaluation Process
GeoscienceData
Directorate
Change ManagementDirectorate
Information Communication
Technology Directorate
Gender Mainstreaming
Directorate
Legal Affairs
Directorate
Public Relation & Communication
Directorate
HIV AID Focal
Directorate
Procurement & Finance, Property Administration & General
Services, Drilling Equipment & Vehicles Maintenance
& Transport Support DirectorateAudit
Directorate
Ethics Liaison Officer
Chief Geologist Hundie Melka
Basic Geoscience
Mapping Directorate
Mineral Exploration
& Evaluation Directorate
GroundwaterResource
AssessmentDirectorate
Geo-hazards Investigation Directorate
Geothermal Resource
Exploration & Assessment Directorate(37 officers)
GeoscienceLaboratory
Centre
Drilling Service Centre
Scientific Equipment
Engineering,Repair &
Maintenance Centre
Geothermal Resource Exploration &Assessment Directorate
Reservoir Engineering Section Chief: Akalewold Seifu Feleke
Quota: 9 Occupied: 6
Geology Section Chief: Selamawit Worku
Quota: 7 Occupied: 5
Geochemistry Section Chief: Asfaw Teclu
Quota: 7 Occupied: 4
Geophysics Section Chief: Yiheis Kebede
Quota: 14 Occupied: 12
Director Solomon Kebede
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(4) Ethiopian Energy Agency (EEA)
The Electricity Proclamation No. 86/1997 of June 1997 paved the way for the establishment of the
Ethiopian Electricity Agency as an autonomous federal government organization. The Ethiopian
Energy Authority (EEA), which was established in 2000, replaced the Ethiopian Electricity Agency in
2013 by the Energy Proclamation No.810/2013, and is tasked to oversee EEP/EEU and controls the
investments in the country. EEA is responsible for the regulation of operations in the electricity supply
sector including licensing and ensuring safety and quality standards and has also set prices for the
private and state power distributors.
To regulate electricity generation, transmission, distribution, and sale of electricity, EEA is responsible
for setting the tariffs and regulating and supervising access by private operators to the electricity grid,
which includes the approval of power purchase agreements (PPAs).
(5) Ethiopian Electric Power (EEP)/ Ethiopian Electric Utility (EEU)
Ethiopian Electric Power Corporation (EEPCo) was the only government body that is responsible for
planning, investing, commissioning, and operating electricity generation, transmission, distribution,
and sale of electricity throughout Ethiopia. The predecessor, Ethiopian Electric Light and Power
Authority (EELPA) was established in 1956 and rebuilt as EEPCo in 1997 by Regulation Number
18/1997.
As shown in Figure 2.2.4, EEPCo was split into two public enterprises in December 2013, i.e., namely
Ethiopian Electric Power (EEP) and Ethiopian Electric Utility (EEU). The aim of this restructuring
was to create modern entities capable of providing efficient, reliable, and high-quality services. EEP is
responsible for construction and operation of the power generation and transmission while EEU is
responsible for construction and operation of power distribution and sales. EEU which is in charge of
the electricity delivery has already awarded a consortium of three Indian companies a two-year and
half management contract for USD 21 million in August 2013. The companies have responsibility for
increasing the efficiency of the operation, distribution and sale of electric power and also support the
efficiency increase and capacity building of generation operation and transmission operation of EEP.
Geothermal development projects including on-going projects of Aluto-Langano and Corbetti are
managed by the Generation Projects section in EEP and overall electric generation planning is
conducted by the Planning section of the Corporate Functions in Figure 2.2.4.
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Source: World Bank
Figure 2.2.4 EEP and EEU Organization Chart
2.2.3 Power Demand Forecast
For the purpose of formulating the master plan on development of geothermal energy, the demand
forecast for power given by EEP was reviewed. The latest forecast is conducted by former EEPCo in
the study of “Ethiopian Power System Expansion Master Plan (hereinafter EEPCo master plan)” based
on the records up to 2011.
(1) Past Growth of Power Demand
Table 2.2.2 and Figure 2.2.5 show the historical energy sales from 2002 to 2011. Total electricity sales
has increased with high growth rates of around 5% to 25%, and reached 4,069.68 GWh in 2011,
although sales temporarily decreased in 2009 due to a worldwide economic crisis. The electricity
consumer is divided into four categories based on tariff category as shown in Figure 2.2.6, namely,
domestic (1,632.86 GWh, 40%), commercial (955.56 GWh, 23%), street light (25.75 GWh, 1%),
industrial LV (711.47 GWh, 18%), and industrial HV (744.04 GWh, 18%). By category, because of the
increase in number of connections with an electrification growth in the Universal Electricity Access
Program (UEAP), domestic power demand has greatly increased and has tripled in the past decade.
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Table 2.2.2 Electricity Sales (GWh: 2007-2012)
Source: Ethiopian Power System Expansion Master Plan, EEPCo (modified by the JICA Project Team)
Source: Ethiopian Power System Expansion Master Plan, EEPCo (arranged by the JICA Project Team)
Figure 2.2.5 Electrical Sales and Number of Customers
Source: Ethiopian Power System Expansion Master Plan, EEPCo (arranged by the JICA Project Team)
Figure 2.2.6 Electrical Sales Growth by Category and Share in 2011 (GWh)
No. Category Type 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011
Sales (GWh) 568.66 583.92 637.94 704.58 759.76 973.11 1,087.42 1,191.68 1,350.34 1,632.86
Domestic No.Connection 535,254 571,975 637,016 739,009 820,514 923,390 1,177,627 1,250,802 1,263,655 1,381,963
kWh/Connection 1,062 1,021 1,001 953 926 1,054 923 953 1,069 1,182
Sales (GWh) 381.95 391.32 444.81 507.70 556.73 638.24 788.08 625.12 717.42 955.56
Commercial No.Connection 79,731 83,806 91,863 104,331 114,281 125,853 166,233 165,351 166,166 202,475
kWh/Connection 4,791 4,669 4,842 4,866 4,872 5,071 4,741 3,781 4,317 4,719
Sales (GWh) 12.55 16.60 21.18 28.35 32.13 44.80 44.94 18.79 20.38 25.75
Street light No.Connection 985 1,139 1,267 1,546 1,782 2,105 2,455 2,635 1,959 3,013
kWh/Connection 12,743 14,574 16,717 18,338 18,030 21,283 18,305 7,131 10,403 8,546
Sales (GWh) 301.02 369.65 346.88 401.46 494.06 489.16 654.01 519.24 562.93 711.47
Large Industry LV No.Connection 7,957 8,204 8,871 10,036 11,422 12,083 18,432 18,104 14,682 21,071
kWh/Connection 37,831 45,057 39,103 40,002 43,255 40,483 35,482 28,681 38,342 33,765
Sales (GWh) 330.92 313.96 364.37 386.83 468.05 404.80 576.00 543.01 599.70 744.04
Large Industry HV No.Connection 96 93 101 122 131 154 200 169 114 163
kWh/Connection 3,447,106 3,375,914 3,607,624 3,170,738 3,572,901 2,628,571 2,880,000 3,213,077 5,260,526 4,564,663
Sales (GWh) 1,595.10 1,675.45 1,815.18 2,028.92 2,310.73 2,550.11 3,150.45 2,897.84 3,250.77 4,069.68Growth Rate (%) - 5.04% 8.34% 11.78% 13.89% 10.36% 23.54% -8.02% 12.18% 25.19%No.Connection 624,023 665,217 739,118 855,044 948,130 1,063,585 1,364,947 1,437,061 1,446,576 1,608,685
kWh/Connection 2,556.16 2,518.65 2,455.87 2,372.88 2,437.14 2,397.66 2,308.11 2,016.50 2,247.22 2,529.82
Sub Total
4
5
1
2
3
1,595.101,675.451,815.18
2,028.922,310.73
2,550.11
3,150.452,897.84
3,250.77
4,069.68
0
200,000
400,000
600,000
800,000
1,000,000
1,200,000
1,400,000
1,600,000
1,800,000
0.00
500.00
1,000.00
1,500.00
2,000.00
2,500.00
3,000.00
3,500.00
4,000.00
4,500.00
5,000.00
2002 2003 2004 2005 2006 2007 2008 2009 2010 2011
Sales (GWh)
No.Connection
Sale
s (G
Wh)
No.
of C
onne
ctio
n
0.00
200.00
400.00
600.00
800.00
1,000.00
1,200.00
1,400.00
1,600.00
1,800.00
2002 2003 2004 2005 2006 2007 2008 2009 2010 2011
Domestic
Commercial
Street light
Large Industry LV
Large Industry HV
Sale
s (G
Wh)
1,632.86, 40%
955.56, 23%25.75, 1%
711.47, 18%
744.04, 18%
Domestic
Commercial
Street light
Large Industry LV
Large Industry HV
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Table 2.2.3 shows the electrical energy sold and generated for the years 2002 to 2011 and the system
peak load and load factor. In 2011, an electric power of 4,954 GWh was generated by all power plants
with total installed capacity of 2,167 MW in Ethiopia. Energy loss varying from 10%–20% from 2002
to 2011 has been comparatively high because of transmission distribution loss. System peak demand
has also increase more than twice in the past decade and was recorded 914 MW.
Table 2.2.3 Generated Energy Sent out and Peak Demand (2002-2011)
Source: Ethiopian Power System Expansion Master Plan, EEPCo (arranged by the JICA Project Team)
Based on the Eastern Africa Power Pool (EAPP) framework and the power purchase agreements
(PPAs) between Ethiopia and its neighboring countries, Ethiopia has exported electricity to
neighboring countries such as Djibouti, Kenya and Sudan. Summary of the agreement regarding the
power purchase is shown below.
- First 400 MW to Kenya (Around 3,000 GWh)
- 100 MW to Djibouti (Around 570 GWh)
- First 100 MW to Sudan (Around 880 GWh)
- First 200 MW to South Sudan/Egypt (Around 1,300 GWh)
- First 200 MW to Tanzania (Around 1,399 GWh)
(2) Power Demand Forecast
As mentioned above, the power demand has increased with a high growth rate in the past decade. The
power demand is expected to increase in the future not only due to increase in domestic consumers but
also new consumers such as railway constructions, large-scale irrigation facilities, new industries, and
electricity exports. The EEPCo master plan conducted the electricity forecast for the period from 2013
to 2037 and covers reference, high and low cases.
The EEPCo master plan study has conducted the forecast for each category such as domestic,
commercial, industrial, and irrigation using a combination of regression analysis load forecast model
and end-user models.
The total energy requirement in Ethiopia is forecasted from 6,425 GWh in 2012 to 111,388 GWh in
2037 as shown in Table 2.2.4. It was forecasted to have high growth. In particular, the growth for the
first ten years is very high because of the large growth in the industrial and irrigation sectors, and the
new electrical demand of the new railway.
2002 2003 2004 2005 2006 2007 2008 2009 2010 2011
Energy Sales (GWh) 1,595.10 1,675.45 1,815.18 2,028.92 2,310.73 2,550.11 3,150.45 2,897.84 3,250.77 4,069.68
Generation Sent-Out (GWh) 1,784 2,028 2,278 2,540 2,845 3,269 3,502 3,665 3,946 4,954Energy Loss (%) 10.6% 17.4% 20.3% 20.1% 18.8% 22.0% 10.0% 20.9% 17.6% 17.9%
System Maximum Demand (MW) 391 405 454 521 587 623 675 673 767 914
System Load Factor (%) 52% 57% 57% 56% 55% 60% 59% 62% 59% 62%
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Table 2.2.4 Energy Requirement Forecast in Categories (Reference Case)
Source: Ethiopian Power System Expansion Master Plan, EEPCo (arranged by JICA Project Team)
The peak demand in Ethiopia was estimated from the total sales forecast. The peak demand will reach
21,731 MW in 2037 from 1,186 MW in 2012 in the reference case. The averaged growth rate is
12.3%.
Table 2.2.5 Peak Demand Forecast (Reference Case)
Source: Ethiopian Power System Expansion Master Plan, EEPCo
Domestic UAEP CommercialStreet
LightingLV
IndustrialHV
IndustrialNew
IndustryTransport(Railway)
Irrigation Sugar Total Sales Total LossesGenaration
Sent-out
2012 1,912 22 1,193 33 711 744 302 - - 5 4,922 1,503 6,4252013 2,192 206 1,350 35 711 744 1,036 - - 49 6,323 1,910 8,2332014 2,358 401 1,529 37 711 744 2,376 - 156 101 8,413 2,513 10,9262015 2,512 605 1,736 39 711 744 4,303 404 389 101 11,544 3,143 14,6872016 2,648 821 1,928 41 711 744 6,723 633 778 101 15,128 3,595 18,7232017 2,761 1,051 2,143 44 711 744 9,729 938 1,167 101 19,389 3,972 23,3612018 2,853 1,300 2,383 46 711 744 12,638 1,062 1,561 101 23,399 4,097 27,4962019 2,926 1,556 2,646 48 711 744 14,805 1,185 2,214 101 26,936 4,312 31,2482020 2,982 1,845 2,937 51 711 744 16,461 1,477 2,866 101 30,175 4,790 34,9652021 3,025 2,144 3,255 54 711 744 18,393 1,642 3,519 101 33,588 5,287 38,8752022 3,058 2,502 3,602 57 1,072 1,153 20,324 1,818 4,172 101 37,859 5,909 43,7682023 3,082 2,936 3,980 60 1,466 1,602 20,324 2,162 4,824 101 40,537 6,273 46,8102024 3,100 3,460 4,389 64 1,896 2,095 20,324 2,373 5,477 101 43,279 6,639 49,9182025 3,114 4,039 4,833 67 2,362 2,633 20,324 2,583 6,130 101 46,186 7,024 53,2102026 3,124 4,708 5,313 71 2,867 3,219 20,324 2,849 6,782 101 49,358 7,441 56,7992027 3,131 5,455 5,833 75 3,412 3,855 20,324 3,135 7,435 101 52,756 7,883 60,6392028 3,137 6,266 6,393 79 3,998 4,542 20,324 3,456 8,088 101 56,384 8,425 64,8092029 3,141 7,128 6,996 83 4,625 5,282 20,324 3,789 8,740 101 60,209 8,997 69,2062030 3,144 8,029 7,642 88 5,294 6,076 20,324 4,123 9,393 101 64,214 9,595 73,8092031 3,146 8,939 8,331 92 6,006 6,924 20,324 4,542 10,046 101 68,451 10,228 78,6792032 3,148 9,871 9,065 98 6,758 7,825 20,324 4,994 10,699 101 72,883 10,890 83,7732033 3,149 10,822 9,842 103 7,551 8,779 20,324 5,448 11,351 101 77,470 11,576 89,0462034 3,150 11,789 10,668 109 8,384 9,785 20,324 5,923 11,967 101 82,200 12,283 94,4832035 3,150 12,772 11,536 115 9,253 10,841 20,324 6,398 12,583 101 87,073 13,011 100,0842036 3,151 13,773 12,444 121 10,157 11,943 20,324 6,880 13,199 101 92,093 13,761 105,8542037 3,151 14,485 13,391 128 11,093 13,088 20,324 7,331 13,816 101 96,908 14,480 111,388
Year
Sales Forecast (GWh)
Max Demandat Comsumer Level (MW)
Power Loss(%)
Max Demand(MW)
Power Load Factor
(%)2012 847 28.6% 1,186 61.8%2013 1,087 28.3% 1,516 62.0%2014 1,436 27.9% 1,992 62.6%2015 1,951 26.1% 2,641 63.5%2016 2,543 23.8% 3,335 64.1%2017 3,229 21.4% 4,107 64.9%2018 3,876 19.2% 4,795 65.5%2019 4,499 18.1% 5,496 64.9%2020 5,092 18.1% 6,219 64.2%2021 5,704 18.1% 6,962 63.7%2022 6,439 18.0% 7,848 63.7%2023 6,976 18.0% 8,504 62.8%2024 7,527 18.0% 9,176 62.1%2025 8,108 17.9% 9,881 61.5%2026 8,738 17.9% 10,644 60.9%2027 9,410 17.9% 11,455 60.4%2028 10,123 17.9% 12,335 60.0%2029 10,870 18.0% 13,256 59.6%2030 11,647 18.1% 14,213 59.3%2031 12,461 18.1% 15,215 59.0%2032 13,306 18.1% 16,254 58.8%2033 14,176 18.2% 17,322 58.7%2034 15,063 18.2% 18,410 58.6%2035 15,973 18.2% 19,526 58.5%2036 16,906 18.2% 20,669 58.5%2037 17,777 18.2% 21,731 58.5%
Max Demand
Year
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As mentioned above, the Government of Ethiopia has agreed electricity purchase with neighboring
countries. The maximum demand and energy sales of the export were forecasted as shown below.
Energy export sales are forecast to grow from 1,445 GWh in 2013 to 35,303 GWh by 2037, and the
total demands (MW) of exports are forecast to grow from 140 MW in 2012 to 4,080 MW by 2037.
Table 2.2.6 Coincident Export Maximum Demand and Energy Forecast (Reference Case)
Source: Ethiopian Power System Expansion Master Plan, EEPCo (arranged by JICA Project Team)
Table 2.2.7 presents the overall load forecast including exports in each case at the generation sent-out
level. Figure 2.2.7 shows the total energy generation while Source: Ethiopian Power System Expansion
Master Plan, EEPCo (arranged by JICA Project Team)
Figure 2.2.8 shows the peak demand. Energy generation and peak demand in reference case are
forecasted to reach 146,691 GWh and 25,761 MW by 2037, respectively.
Table 2.2.7 Energy Requirement and Peak Demand Forecast including Exports (2012-2037)
Djibouti SudanSudan
andEgypt
Kenya Kenya II Tanzania Total Djibouti SudanSudan
andEgypt
Kenya Kenya II Tanzania Total
(MW) 100 100 200-3100 400 200-1200 200-400 100 100 200-3100 400 200-1200 200-400Load factor 65% 100% 75% 85% 75% 75% 65% 100% 75% 85% 75% 75%
2012 40 100 0 0 0 0 140 395 68 0 0 0 0 4632013 65 100 0 0 0 0 165 569 876 0 0 0 0 1,4452014 65 100 0 0 0 0 165 569 876 0 0 0 0 1,4452015 65 100 150 0 0 0 315 569 876 1,314 0 0 0 2,7592016 65 100 150 0 0 0 315 569 876 1,314 0 0 0 2,7592017 65 100 450 340 0 0 955 569 876 3,942 2,978 0 0 8,3652018 65 100 450 340 0 0 955 569 876 3,942 2,978 0 0 8,3652019 65 100 600 340 0 0 1105 569 876 5,256 2,978 0 0 9,6792020 65 100 600 340 0 150 1255 569 876 5,256 2,978 0 1,314 10,9932021 65 100 900 340 150 150 1705 569 876 7,884 2,978 1,314 1,314 14,9352022 65 100 900 340 150 150 1705 569 876 7,884 2,978 1,314 1,314 14,9352023 65 100 1200 340 150 300 2155 569 876 10,512 2,978 1,314 2,628 18,8772024 65 100 1200 340 300 300 2305 569 876 10,512 2,978 2,628 2,628 20,1912025 65 100 1500 340 450 300 2755 569 876 13,140 2,978 3,942 2,628 24,1332026 65 100 1500 340 450 300 2755 569 876 13,140 2,978 3,942 2,628 24,1332027 65 100 1650 340 600 300 3055 569 876 14,454 2,978 5,256 2,628 26,7612028 65 100 1650 340 750 300 3205 569 876 14,454 2,978 6,570 2,628 28,0752029 65 100 1650 340 900 300 3355 569 876 14,454 2,978 7,884 2,628 29,3892030 65 100 1950 340 900 300 3655 569 876 17,082 2,978 7,884 2,628 32,0172031 65 100 1950 340 900 300 3655 569 876 17,082 2,978 7,884 2,628 32,0172032 65 100 2175 340 900 300 3880 569 876 19,053 2,978 7,884 2,628 33,9882033 65 100 2250 340 900 300 3955 569 876 19,710 2,978 7,884 2,628 34,6452034 65 100 2250 340 900 300 3955 569 876 19,710 2,978 7,884 2,628 34,6452035 65 100 2325 340 900 300 4030 569 876 20,367 2,978 7,884 2,628 35,3022036 65 100 2325 340 900 300 4030 569 876 20,367 2,978 7,884 2,628 35,3022037 65 100 2325 340 900 300 4030 569 876 20,367 2,978 7,884 2,628 35,302
Coincident Export Maximum Demand (MW) Energy Export (GWh)
Year
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Source: Ethiopian Power System Expansion Master Plan, EEPCo (arranged by JICA Project Team)
*Actual record in 2012
Source: Ethiopian Power System Expansion Master Plan, EEPCo (arranged by JICA Project Team)
Figure 2.2.7 Energy Requirement Forecast including Exports (2012-2037)
Reference High Low Reference High Low
2012* 6,906 6,906 6,906 1,378 1,378 1,378
2013 9,680 10,763 9,034 1,681 1,884 1,5752014 12,371 14,171 11,272 2,157 2,483 1,9752015 17,447 21,490 14,393 2,956 3,560 2,4992016 21,482 26,462 18,376 3,650 4,392 3,1392017 31,729 38,469 23,700 5,062 6,037 3,938
2018 35,862 43,582 28,411 5,750 6,872 4,6512019 40,929 50,918 32,045 6,601 8,037 5,2702020 45,960 56,932 34,760 7,474 9,080 5,7982021 53,811 66,454 39,073 8,667 10,525 6,5062022 58,703 73,037 42,220 9,553 11,685 7,094
2023 65,689 82,171 44,006 10,659 13,113 7,5102024 70,110 88,210 45,748 11,481 14,206 7,9272025 77,343 97,294 48,848 12,636 15,671 8,5042026 80,933 103,018 50,790 13,399 16,788 8,9642027 87,401 112,572 52,838 14,510 18,373 9,448
2028 92,885 120,831 55,044 15,540 19,854 9,9702029 98,597 129,718 59,968 16,611 21,440 10,8122030 105,827 141,098 66,263 17,868 23,331 11,8172031 110,698 149,902 68,742 18,870 24,955 12,3922032 117,761 160,036 71,300 20,134 26,756 12,983
2033 123,693 172,152 73,929 21,277 28,808 13,5872034 129,127 182,951 76,591 22,365 30,726 14,1932035 135,386 196,419 79,296 23,556 32,972 14,8092036 141,157 208,659 82,045 24,699 35,105 15,4332037 146,691 221,594 84,803 25,761 37,341 16,061
*Actual record in 2012
Total Energy Requirement (GWh) Total Peak Demand (MW)Year
17,447
45,960
77,343
110,698
135,386146,691
21,490
56,932
97,294
149,902
196,419
221,594
6,90614,393
34,76048,848
68,74279,296 84,803
0
50,000
100,000
150,000
200,000
250,000
2012
*
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
Reference High LowGWh
Year
Power Generation
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*Actual record in 2012
Source: Ethiopian Power System Expansion Master Plan, EEPCo (arranged by JICA Project Team)
Figure 2.2.8 Peak Demand Forecast including Exports (2012-2037)
2,956
7,474
12,636
17,868
23,55625,761
3,560
9,080
15,671
23,331
32,972
37,341
1,3782,499
5,798
8,504
11,817
14,80916,061
0
5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
2012
*
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
Reference High Low
Year
MW
Peak Demand
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2.2.4 Power Generation Planning
(1) Existing Power Plant
There are two electrical supply systems in Ethiopia, namely, on-grid Inter-Connected System (ICS)
and off-grid Self-Contained System (SCS). Table 2.2.8 shows the installed capacity for both ICS and
SCS. According to Facts in Brief 2011/12 of EEPCo and the EEPCo master plan study, total capacities
of ICS and SCS are 2,140.20 MW and 26.80 MW, respectively in 2012, with a total capacity of 2,167
MW. The number and type of power plants in ICS are: 12 hydropower (1,940.6 MW), 13 diesel (112.3
MW), 1 geothermal (7.3 MW), and 2 wind, which generate about 6,000 GWh. Table 2.2.9 shows the
power generation in the past five years. Because of new hydropower plants such as Gigel Gibe II, Tana
Beles, Tekeze and Amerti Neshe, power generation has been largely increasing for the past two years.
The Aluto-Langano Geothermal Power Plant is the only geothermal power plant in Ethiopia at present,
which is a binary generation of 7.3 MW commissioned in 1999. Due to leak in the heat exchanger
tubes, the plant was shut down 18 months after starting its operation. The plant was rehabilitated but
current generation was decreased to 5 MW. As of April 2014, the plant has not been in production due
to maintenance problem.
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Table 2.2.8 Installed Capacity of ICS and SCS, as of July 7, 2012 (2004 E.F.Y)
Source: Facts in Brief 2011/12, EEPCo
No. Power Plant Capacity (MW) Initial Year
ICS Generation Plant
Hydro 1940.61 Koka 43.2 1960
2 Tis Abay I 11.4 1964
3 Awash II 32.0 1966
4 Awash III 32.0 1971
5 Finchaa 134.0 1973/2003
6 Meleka Wakana 153.0 1988/refurb in 2014
7 Tis Abay II 73.0 2001
8 Gilgel Gibe 184.0 2004
9 Gilgel Gibe II 420.0 2010
10 Tana Beles 460.0 2010
11 Tekeze 300.0 2010
12 Amerti Neshe 98.0 2011
Geothermal 7.31 Aluto Langano 7.3 1999
Diesel 112.31 Alemaya 2.3 1958
2 Ghimbi 1.1 1962/1984
3 Dire Dawa (mu) 4.5 1965
4 Axum 3.2 1975/1992
5 Shire 0.8 1975/1991/1995
6 Nekempt 1.1 1984
7 Mekelle 5.7 1984/1991/1993
8 Adigrat 2.5 1992/1993/1995
9 Adwa 3.0 1998
10 Kaliti 14.0 2004
11 Dire Dawa 38.0 2004
12 Awash 7 Kilo 35.0 2004
13 Jimma 1.1
Wind 81.01 Ashegoda 30.0 Jan/2012
2 Adama I 51.0 Mar/2012
ICS Total 2,141.2
SCS Generation Plant
Hydro 6.151 Yadot 0.35
2 Sor 5.00
3 Dembi 0.80
Diesel 20.65 Isolated diesel power plants
SCS Total 26.8
(ICS+SCS) Total 2,168.0
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Table 2.2.9 Power Production (GWh)
Source: Facts in Brief 2011/12, EEPCo
(2) Planned and Committed Power Plants (Non-geothermal) Hydropower
Ethiopia has a very high hydropower potential available for power generation. In the past five years
(2009-2013), four hydro power plants with a total capacity of around 1,200 MW were commissioned
and tripled the overall capacity in Ethiopia. There are 12 existing plants with installed capacity of
around 1,800 MW and one plant has been under refurbishment. Figure 2.2.9 shows the location map of
existing, committed, and proposed hydropower plants. Three plants, i.e., Gilgel Gibe III, Genale Dawa
III, and Grand Renaissance, are under construction. If their constructions are completed in five years
as scheduled, the total installed capacity of hydropower will be around 10,000 MW in 2018. The
progress of the three hydropower plants under construction is mentioned below.
Gilgel Gibe III: The construction of the dam, which is 243m high, was started in 2006, and is 88%
complete as of October 2014 and expected to reach 92% by the end of this fiscal year. The first of ten
System Generation Type 2007/08 2008/09 2009/10 2010/11 2011/12
Hydro 3,353.60 3,277.14 3,503.79 4,922.00 6,239.29
Diesel 133.13 381.78 407.41 14.00 0.00
Geothermal - 13.87 23.61 18.00 7.98
Wind - - - - 29.40
Sub-total 3,486.73 3,672.79 3,934.81 4,954.00 6,276.67
Hydro 16.49 19.23 20.11 9.00 1.84
Diesel 28.48 35.77 26.15 17.00 11.07
Sub-total 44.97 55.00 46.26 26.00 12.91
Hydro 3,370.09 3,296.37 3,523.90 4,931.00 6,241.13
Diesel 161.61 417.55 433.56 31.00 11.07
Geothermal - 13.87 23.61 18.00 7.98
Wind - - - - 29.40
Total 3,531.70 3,727.79 3,981.07 4,980.00 6,289.58
SCS
ICS
Total
0.00
1,000.00
2,000.00
3,000.00
4,000.00
5,000.00
6,000.00
7,000.00
2007/08 2008/09 2009/10 2010/11 2011/12
Hydro
Diesel
Geothermal
Wind
Production (G
Wh)
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planned turbines was scheduled to start generating 187 MW in September 2014, but due to financial
problem, the project has been delayed. The following nine turbines are expected to take about a year
for the dam to be fully operational and generate 1,870 MW.
Genale Dawa III: The construction was started in mid-2012 and around 25% complete in 2013 and
60% as of October 2014. It is expected to be fully completed by 2015 and to provide 254 MW.
Grand Renaissance: The construction of the Grand Ethiopian Renaissance Dam was started since
April 2011. The dam with 6,000 MW of installed capacity will be the largest hydroelectric power plant
in Africa when completed, as well as the 8th largest in the world. The construction of the dam
progressed to around 20% at the end of 2013, and was at 40% complete as of October 2014. The first
stage of the dam will be operational from June 2015 and will produce 700 MW of electricity. The rest
of the units will be completed and a total of 6,000 MW will be generated in 2018.
Source: Ethiopian Power System Expansion Master Plan, EEPCo
Figure 2.2.9 Location Map of Existing, Committed, and Proposed Hydropower Plants
There have been many hydropower plant schemes proposed over the years. There are 28 schemes that
contribute to the overall capacity of around 12,400 MW. Table 2.2.10 shows the list of committed and
proposed hydropower plants. In the new EEPCo master plan study, the averaged levelized cost of each
proposed hydropower plant was estimated, and was used in ranking the candidate hydropower plants.
Adiss Ababa
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Table 2.2.10 Committed and Proposed Hydropower Plant
Source: Ethiopian Power System Expansion Master Plan, EEPCo (arranged by the JICA Project Team)
Wind Power
The Ethiopian government has planned to generate up to 890 MW of wind energy by the end of the
Growth and Transformation Plan (GTP) period. In 2009, the first wind farm in Ethiopia was
constructed in Adama, which has 34 x 1.5 MW wind turbines. The Ashegoda Wind Farm, which is 10
km from Mekelle, was completed in 2013. The total installed capacity of the Ashegoda Wind Farm
will be 120 MW. The Ashegoda Project, which costs about EUR 210 million, was funded by the
French bank- BNP Paribas, the French Development Agency, and EEPCo. The Adama II Wind Farm
Project, an extension of the Adama Project, is in progress. EEPCo signed an agreement with the
Chinese GCOC Company and Hydrochina Company for the construction of a wind farm with 102 x
1.5 MW wind turbines, with a total capacity of 153 MW. The project costs USD 340 million, and the
Chinese Export & Import Bank provides a soft loan.
Ethiopia has an estimated 10 GW of potential wind capacity. The Hydrochina Corporation
collaborated with the Ministry of Water and Energy and formulated the Wind Power and Solar Energy
Inst.(MW)
Avil. Cap.(MW)
Ave. Gen.(GWh)
Hydro - Under Construction 8124.0 6274.0 21826.01 Gilgel Gibe III (enters 2014) 748.0 427.0 2148.0 2014
- Gilgel Gibe III (enters 2015) 1122.0 640.0 3222.0 20152 Genale Dawa III 254.0 250.0 1695.0 20153 Grand Renaissance (enters 2015) 500.0 413.0 1230.0 2014
- Grand Renaissance (enters 2017) 5500.0 4544.0 13531.0 2018Hydro - Candidate 12406.9 12062.6 59279.3
1 Beko Abo 935.0 935.0 6632.2 2022
2 Genji 216.0 214.0 910.2 2020
3 Upper Mendaya 1700.0 1700.0 8582.3 2023
4 Karadobi 1600.0 1493.9 7857.2 2021
5 Geba I + Geba II 371.5 343.6 1709.4 2020
6 Genale VI 246.0 237.2 1532.4 2020
7 Gibe IV 1472.0 1409.6 6146.4 2020
8 Upper Dabus 326.0 326.0 1460.3 2020
9 Sor II 5.0 4.8 38.5 2017
10 Birbir R 467.0 443.7 2724.1 2020
11 Halele + Werabesa 436.0 417.2 1972.8 2020
12 Yeda I + Yeda II 280.0 275.9 1089.4 2020
13 Genale V 100.0 100.0 574.6 2020
14 Gibe V 660.0 603.5 1904.9 2020
15 Baro I + Baro II 645.0 645.0 2614.3 2020
16 Lower Didessa 550.0 550.0 975.6 2020
17 Tekeze II 450.0 450.0 2720.7 2020
18 Gojeb 150.0 134.2 561.7 2020
19 Aleltu East 189.0 173.8 804.1 2020
20 Tams 1000.0 1000.0 6057.2 2020
21 Abu Samuel 6.0 6.0 15.7 2020
22 Aleltu West 264.6 262.7 1067.3 2020
23 Wabi Shebele 87.8 86.5 691.0 2020
24 Lower Dabus 250.0 250.0 637.0 2020
Power Plant CO D
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Master Plan in 2012 with financial support from the Chinese government. The master plan study
identified 51 candidates for wind farm located mainly on high terrain.
Table 2.2.11 Existing and Committed Wind Farm
No. Wind Farm Capacity
(MW) Generation
(GWh) Annual
Load Factor COD
Existing Wind Farm 171 428 1 Adama I 51 150 33.6% 2012
2 Ashegoda (enters 2012) 30 70 26.5% 2012
- Ashegoda (enters 2014) 90 208 26.4% 2014
Committed Wind Farm 153 424 1 Adama II 153 424 31.6% 2015
Total 324 852
Source: Ethiopian Power System Expansion Master Plan, EEPCo (arranged by the JICA Project Team)
Solar Power
In general, Ethiopia is rich in solar radiation resource, as it is located on a low latitude region with
approximately perpendicular incidence of sunshine. But currently, solar power is only used for off-grid
systems such as telecommunications equipment in rural areas. In rural electrification schemes, there is
a plan to use solar power. However, there is no scheme to connect ICS, and no plant has been
committed so far.
Some studies, including the Wind Power and Solar Energy Master Plan conducted by the Hydrochina
Corporation, has conducted the analysis and identified some potential site for photovoltaic power
plants. Table 2.2.12 summarizes the candidates examined in the EEPCo master plan study. The study
expected 100 MW of solar power generation per plant.
Table 2.2.12 Candidate Sites for Solar Power Generation
No. Solar Power Plant GHI
(kWh/m2)Yield
(kWh/kWp/year)Energy Output
MWh/year CF (%)
Solar PlantSize (MW)
Candidate Site
1 Mekele 2391.2 20,542 205,420 23.4% 100
2 Jijiga 2379.7 20,184 201,840 23.0% 100
3 Addis Ababa 1934.5 16,639 166,390 19.0% 100
4 Border Ethiopia – Kenya 1903.6 15,561 155,610 17.8% 100
5 Border Ethiopia – Somalia 2086.0 16,697 166,697 19.1% 100
GHI: Global Horizontal Irradiance, CF: Capacity Factor
Source: Ethiopian Power System Expansion Master Plan, EEPCo (arranged by the JICA Project Team)
Biomass Energy
Ethiopia has utilized biomass such as fuel wood, residue of agricultural crops, and animal manure for
basic energy instead of electricity. Two biomass plants, namely Bamza and Meikasedi thermal power
plants, have been planned as candidate plants. As the biomass plants use bagasse as fuel, these are
unavailable for four months during the off-crop season. Table 2.2.13 summarizes the proposed
biomass energy plants.
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Table 2.2.13 List of Proposed Biomass Energy Plants
Biomass Power Plant Bamza Meikasedi
Rated Power (MW) 120 138
Nominal Output (MW) 60 60
First Year of Operation 2016 2016
Fuel Type Wood Fuel
Bagasse Prosopis Bagasse
Source: Ethiopian Power System Expansion Master Plan, EEPCo (arranged by the JICA Project Team)
Waste Power Generation
EEPCo finalized a turnkey contract with the Cambridge Industries Ltd. to design and construct a 50
MW capacity waste-to-energy plant in the Repi area, Addis Ababa in 2013. This will be the first
waste-to-energy plant in Ethiopia. And also, Cambridge Industries Ltd. has conducted detailed
feasibility studies throughout Ethiopia to recommend future projects in various cities including Dire
Dawa, Adama, Mekelle, Gonder, Behar Dar, Hawasa, and Jimma. Table 2.2.14 summarizes the
committed waste-to-energy plants.
Table 2.2.14 Proposed Waste-to-Energy Sites
Item Addis Ababa
Waste Energy Plant
Rated Power (MW) 50
Nominal Output (MW) 20
First Year of Operation 2015
Fuel Type Municipal solid waste and
selected industrial waste
Source: Ethiopian Power System Expansion Master Plan, EEPCo (arranged by the JICA Project Team)
Sugar Factories
The Ethiopian sugar factories have planned to sell their surplus electricity to the grid. The electricity is
generated by the process of burning bagasse. Power generation is conducted only in the period from
October to May because of bagasse production.
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Table 2.2.15 below shows the installed capacity and energy which can be exported to the grid in each
factory.
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Table 2.2.15 List of Proposed Sugar Factories
Sugar Factories Installed Capacity
(MW)
Export (MW)
Exported Energy (GWh)
COD
Wenji 30 16 77 2013
Finchaa 31 10 48 2013
Tendaue/Ende 120 70 337 2015
Beles 1 30 20 96 2015
Beles 2 30 20 96 2015
Wolkayit 133 82 395 2015
Omo Kuraz 1 60 20 96 2015
Kessem 26 16 77 2015
Beles 3 30 20 96 2016
Omo Kuraz 2 60 40 193 2016
Omo Kuraz 3 60 40 193 2016
Omo Kuraz 4 60 40 193 2017
Omo Kuraz 5 60 40 193 2017
Omo Kuraz 6 60 40 193 2019
Total 474 2,283 Source: Ethiopian Power System Expansion Master Plan, EEPCo (arranged by the JICA Project Team)
Thermal Power Plant
At present, there are 11 thermal power plants using heavy fuel oil and light fuel oil as shown in Table
2.2.8. There is no committed power plant using gas and oil. The new EEPCo master plan proposed to
operate gas turbines, combined cycle gas turbines (CCGT), and diesel power plants from 2018.
To correspond to the increasing power demand from 2030 or later, thermal power plants will be
needed because the hydropower and geothermal potential could not cover the demand even though all
of them are being developed.
2.2.5 Transmission Planning
(1) Existing and Committed Transmission Lines
Most of the power plants have been connected with the ICS to the consumers though transmission
lines of 400 kV, 230 kV, 132 kV, 66 kV, and 45 kV. Table 2.2.16 presents the total length of the
existing transmission lines and Figure 2.2.10 shows the map of existing and planned transmission
network.
There are many areas where ICS does not connect to/in Ethiopia. SCS, which has supplied electricity
to such areas not connected to ICS, is now starting to sequentially connect to ICS in these past few
years.
EEP (former EEPCo) has connected the transmission line to towns and villages at its expense.
However, the distribution line to houses and offices has to be connected individually at the expense of
the end-user, therefore leaving many poor people unable to pay for connection and access to
electricity.
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Table 2.2.16 Existing Transmission Line Length (km)
No. Voltage Level Single Circuit Double Circuit Total 1 400 kV 621 63 684 2 230 kV 3,376 1,607 4,983 3 132 kV 4,509 133 4,641 4 66 kV 1,902 1,902 5 45 kV 243 9 252
Total 10,650 1,811 12,461 (Source: EEP, summarized by the JICA Project Team)
Source: EEP 2014
Figure 2.2.10 Existing and Committed Electrical Grid in Ethiopia
(2) Universal Electricity Access Program (UEAP)
The Universal Electricity Access Program (UEAP) was started by EEPCo from 2005/06 as part of the
power sector development program to embody the targets of PASDEP, which aimed at connecting a
total of 6,878 towns and villages to the grid, provide energy supply to 24 million people, and attain an
electrification rate of 50% in 2015. Also, it aimed to increase the energy generation capability to 6,386
GWh by 2010. The total cost of the UEAP was estimated at ETB 8.8 billion and the World Bank (WB)
is financing part of it.
Although the aspired target was not fully met, electricity generation increased by 53% from 2,587.2
GWh in 2005 to 3,981.07 GWh in 2010. However, the production increase did not keep pace with the
grid extension activities. Transmission lines increased, from a total length of 8,003.93 km in 2006 to
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10,884.24 km in 2010, while distribution lines’ total length even quadrupled from 33,000 km in 2005
to 126,038 km in 2010.
(3) Transmission Expansion Plan
Transmission expansion plan was developed in the EEPCo master plan study based on the demand
forecast and generation plan mentioned above. The transmission expansion plan was considered to
connect the candidate power plants meeting the electrical demand forecast in two stages, i.e.,
short-term from 2013 to 2020 and long-term from 2021 to 2037.
New 118 transmission substations, 77 substation reinforcements and 13,550 km of new transmission
lines (66 to 500 kV) are planned in the short-term plan, and new 78 transmission substations, 41
substation reinforcements and 9,257 km of new transmission line (132 to 400 kV) as shown in Table
2.2.17.
Table 2.2.17 Plan of New Substation and Transmission Line
Source: Ethiopian Power System Expansion Master Plan, EEPCo (arranged by the JICA Project Team)
Source: Ethiopian Power System Expansion Master Plan, EEPCo (arranged by the JICA Project Team)
Figure 2.2.11 presents the development plan of major transmission line from 230 to 500 kV by 2020
and 2037 and location of the geothermal prospects. The transmission line of 500 kV is limited to the
grand renaissance dam to Addis Ababa and the international connection to Sudan based on the cost
comparison analysis. The main network will comprise 230 and 400 kV transmission lines.
This development plan includes the generation plan of committed geothermal project including
Aluto-1 (Aluto-Langano) and Corbetti. Most of the other geothermal prospects in this project are
located along the existing and planned networks which also run along the Rift Valley.
Year New SubstationNew SubstationReinforcements
Transmission Lines(km)
2013 11 10 2,3432014 9 3 1,1672015 48 43 4,1882017 25 6 2,4702020 25 15 3,383
Short-Term: Total 118 77 13,5512025 24 8 2,4222030 24 17 2,8092037 29 30 3,185
Long-Term: Total 77 55 8,416
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Source: Ethiopian Power System Expansion Master Plan, EEPCo (arranged by the JICA Project Team)
Figure 2.2.11 Expansion Network Plan (left: short-term, right: long-term)
(4) International Connection Eastern African Power Pool (EAPP)
According to the generation plan mentioned above, Ethiopia is expected to have a capacity of over
13,000 MW by year 2020 and over 24,000 MW by year 2030. Excess generation capacity in Ethiopia
will be available for export to neighboring countries of the Eastern Africa Community. For this
purpose, the EAPP has undertaken an interconnection program schematically represented in Table
2.2.18.
The program has already been partially implemented from the Ethiopia side interconnecting with
Sudan through a 230 kV transmission line, operational for the supply of 100 MW, to be increased in
the future, and the interconnection with Djibouti through a 230 kV transmission line.
Table 2.2.18 Planned Interconnected Transmission Line
No. Connecting Voltage (kV) Capacity (MW) Date 1 Tanzania-Kenya 400 1520 2015 2 Tanzania-Uganda 220 700 2023 3 Uganda-Kenya 220 440 2023 4 Ethiopia-Kenya DC500 2000 2016 5 Ethiopia-Sudan 500 2 x1600 2016 6 Egypt-Sudan DC600 2000 2016 7 Ethiopia-Kenya DC500 2000 2020 8 Ethiopia-Sudan 500 1600 2020 9 Egypt-Sudan DC600 2000 2020
10 Ethiopia-Sudan 500 1600 2025 11 Egypt-Sudan DC600 2000 2025
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Source: EAPP
Ethio-Kenya Electricity Highway Project
The transmission line construction in the Ethio-Kenya Highway Project under Phase 1 of the Regional
Eastern Africa Power Pool Program was started in 2013, and is expected to be completed by 2018. The
governments of Ethiopia and Kenya have received loans from the African Development Bank (AfDB),
and the Government of Kenya has applied for a loan from the French Development Agency (AFD) for
the project cost. The total project cost is about USD 1.3 billion. The project is mainly comprised of a
1,045 km, ± 500 kV high voltage direct current (HVDC) over-head transmission line from
Wolayita-Sodo in Ethiopia to Logonot in Kenya. EEP and the Kenya Electricity Transmission
Company Limited intend to manage the project jointly. Table 2.2.19 shows the project contents.
Table 2.2.19 Ehio-Kenya Electricity Highway Project
No. Location
Size Number Form To
1 Wolaita Sodo ss Logonot ss 500 kV HVDC line 1066 km
2 Converter at each ss 1000 MW
3 Gilgel Gibe III Wolaita Sodo ss 400 kV HVAC line 55 km
4 Logonot ss Ishinya ss 400 kV HVAC line 80 km
5 Synchronous Condenser at Lognot ss 200 MVA 1
ss: sub-station, HVDC: high voltage direct current, HVAC: high voltage alternate current
Source: EEP, arranged by the JICA Project Team
(5) Power Loss
The power loss in Ethiopia is around 20%, which is higher than the international average of 12–13%.
According to EEP, most of the loss happened during the distribution from the national grid to end
users. Therefore, WB has financed some projects of a Swedish company that promotes efficiency in
Addis Ababa and a French company that automates the distribution system.
2.2.6 Financing and Tariff
(1) Electric Power Selling
Table 2.2.20 shows the published consumer tariffs in Ethiopia for 50 years from 1959 to 2003. The
domestic tariff is reduced to around ETB 0.47/kWh (equivalent to around USD 0.03/kWh) with a large
amount of subsidies, so that the poverty group can have access to electricity.
It is suggested that the rich who utilize more electricity should bear more of the costs by progressive
tariffs, which would still ensure the access of the poor whose utilization of electricity is minimal. This
also contributes to the increment of finance of the EEP, which is necessary to expand the service to
achieve the ambitious targets of the GTP.
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Table 2.2.20 Consumer Tariffs
LV: Low Voltage、HV: High Voltage
Source: Ethiopian Power System Expansion Master Plan, EEPCo (arranged by the JICA Project Team)
2.3 Geothermal Power Development
2.3.1 Existing Geothermal Development Plans
There are two existing geothermal development plans as shown in Table 2.3.1, i.e., one by GSE and
one by the EEPCo master plan study. These existing plans need to be improved since they do not
reflect recent activities of several donors including the power purchase agreement (PPA) between
EEPCo and Reykjavík Geothermal agreed in September 2013 for Corbetti Geothermal Development
of 500 MW to 1,000 MW. Likewise in the EEPCo master plan, all candidate geothermal power plants
are sized in multiples of 100 MW capacities for simplicity without considering the site specific
potential and installation plans based on forecast demand.
Table 2.3.1 Existing Geothermal Development Plans
Source: *1GSE, 2010: (Tendaho indicates Tendaho-1 (Dubti) and -3(Allalo Beda) according to interview with GSE)
*2Ethiopian Power System Expansion Master Plan, EEPCo, February 2014: (Tendaho includes Tendaho-1, -2 and -3.
Aluto-Langano includes Aluto-1, -2 and -3)
(arranged by the JICA Project Team)
1952-1964 1988-1989 1990 1991-1998 1999-2003EEPCo ICS SCS EEPCo ICS SCS EEPCo ICS SCS EEPCo EEPCo EEPCo EEPCo EEPCo
1 House Hold 0.1250 0.1250 0.1250 0.1250 0.1425 0.1513 0.1468 0.1425 0.1513 0.1468 0.1772 0.2809 0.3897 0.47352 Commercial 0.0750 0.1250 0.1650 0.1436 0.1525 0.1975 0.1735 0.3436 0.4146 0.3774 0.3653 0.4301 0.5511 0.67233 Street Light 0.1100 0.1500 0.1285 0.1100 0.1500 0.1285 0.3322 0.4146 0.3711 0.3333 0.3087 0.3970 0.48434 Small Industry 0.1333 0.1733 0.1520 0.1333 0.1733 0.1520 0.2232 0.4597 0.32035 LV 0.0475 0.0875 0.0645 0.0625 0.1175 0.0857 0.2232 0.4397 0.3133 0.2563 0.3690 0.4736 0.57786 HV 15kV 0.0288 0.0780 0.0474 0.0588 0.0588 0.2029 0.2029 0.2341 0.2597 0.3349 0.40867 HV 132kV 0.2416 0.3119 0.3805
Total Flat Rate 0.0968 0.0824 0.1241 0.1011 0.1027 0.1556 0.1165 0.2341 0.3500 0.2735 0.2645 0.3086 0.4020 0.4900
1965-1971 1972-1978 1979-1987DescriptionHistorical Flat Tariff Rate (Birr/kWh) EFY
Site
2014 Aluto Langano 52015 52016 Aluto Langano II 70 752017 752018 Tendaho 100 175
Corbetti 75 ~ 300 250 ~ 475
Tulu Moye 40 290 ~ 515Dofan Fantale 60 350 ~ 575
2019 350 ~ 5752020 Abaya 100 450 ~ 675
Year Total(MW)
Installed Capacity(MW)
GSE*1
IntalledUnits
SiteTotal(MW)
2014 0 Aluto Langano 52015 0 52016 0 52017 0 52018 2 Coebetti 200
2019 1 Corbetti 3002020 2 Corbetti 500
2021 2 Aluto Langano 7002022 2 Tendaho 9002023 0 9002024 0 9002025 3 Tendaho, Abaya 12002026 4 Tendaho, Abaya, Tulu Moya 16002027 0 16002028 5 Dofan, Fantale, Tulu Moya, Gedemsa 21002029 2 Tendaho 23002030 2 Teo 25002031 3 Corbetti 28002032 3 Teo, Gedemsa 31002033 3 Aluto Langano, Dofan, Fantale 34002034 3 Tulu Moya, Dofan, Fantale 37002035 5 Corbetti, Dofan, Fantale, Dallol 42002036 4 Dallol, Teo 46002037 4 Teo, Abhe 5000
EEPCo*2
Year
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The EEPCo master plan formulated an overall power generation plan by plant type as shown in Figure
2.3.1 while corresponding energy is presented in Figure 2.3.2. Comparing the electric demand, the
reserve margin will exceed 120% in 2017 with the commissioning of the Grand Ethiopian Renaissance
Dam, but from 2017, it will decline to around 25% by 2037.
Hydropower generation is the largest source of energy and capacity throughout the period. Following
hydropower, geothermal power becomes the next largest energy producer, followed by combined cycle
gas turbine (CCGT) in 2037. Hydropower and geothermal will occupy around 50% and 25% of total
installed capacity, and around 55% and 33% of total power generation in 2037, respectively. In the
EEPCo master plan, wind and solar power generation are planned prior to geothermal power, which is
mainly planned to be developed after 2025, when most of candidate hydropower plants are completed.
Source: Ethiopian Power System Expansion Master Plan, EEPCo, February 2014
Figure 2.3.1 Installed Capacity and Reserve Margin
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Source: Ethiopian Power System Expansion Master Plan, EEPCo, February 2014
Figure 2.3.2 Energy Generation by Plant Type
2.3.2 Committed Geothermal Power Development Plans
In this master plan study, considering the latest information on donor involvements and GSE plan,
existing and committed geothermal sites are ranked in priority order of development.
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Table 2.3.2 summarizes the committed geothermal prospects. The expansion of Aluto-Langano
Geothermal Power Plant has been implemented to boost its capacity to 70 MW from the previous 7 MW.
The four drilling wells up to 2,500 m deep have been started and aim to generate 77 MW of power by
2018. The cost of the project will be covered by the financial assistance from the Government of Japan
and WB as well as the Government of Ethiopia.
In October 2013, Reykjavík Geothermal signed a PPA with EEPCo for the Corbetti geothermal
development of up to 1,000 MW in installed capacity. Reykjavík Geothermal will start drilling up to five
wells with an initial 20 MW output.
The Geothermal Risk Mitigation Facility (GRMF) agreed on 3 March 2014 to give the Ethiopia
Ministry of Mines, a USD 976,872 grant in order to conduct a study in Dofan and Corbetti, Ethiopia.
GRMF was established by the African Union Commission in collaboration with the German Federal
Ministry for Economic Cooperation and Development and the EU-Africa Infrastructure Trust Fund via
KfW Entwicklungs.
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Table 2.3.2 Committed and Planned Geothermal Prospects
MP S No.
Site Planned Capacity
and COD Status of Commitment
2 Tendaho-3 (Allalobeda)
25 MW 2017 ICEIDA/NDF assists surface survey including MT survey.
19 Corbetti
20 MW 80 MW
200 MW 200 MW
2015 2016 2017 2018
Reykjavík Geothermal has agreed with Ethiopian ministries and agreed to PPA with EEPCo that Reykjavík Geothermal develops maximum of 1,000 MW in the next 8-10 years.Using GRMF fund, GSE is conducting a study.
20 Aluto-1 (Aluto-Langano)
75 MW 2018 The Government of Japan and World Bank has assisted in drilling of wells.
21 Tendaho-1 (Dubti)
10 MW 2018 AFD assists in well drilling for 10 MW.
Total 610 MW
MP S.No.: Site numbering in this MP study, AFD: French Development Agency Source: JICA Project Team
2.3.3 Target of the Geothermal Power Development
Target of the geothermal power development is set based on the EEPCo master plan since it
formulates the power generation plan comprehensively taking into consideration economics by plant
type. However, the EEPCo master plan did not include those currently under construction and
committed geothermal power plants; therefore, incorporating the latest information on the donor
involvements in this master plan study, the targets of each term are established as shown in Figure
2.3.3. According to the said figure, the target is set at 700 MW up to 2018, 1,200 MW up to 2025 and
5,000 MW up to 2037. Furthermore, based on geothermal potential derived from the various
geological surveys in this study, the JICA Project Team will compare the economics of geothermal to
that of other candidate plants, and will propose the development order including other plant types.
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Year Short term
up to 2018 Medium term
up to 2025 Long term up to 2037
Installed Capacity (MW)
610 1,200 5,000
Source: EEP, GSE (arranged by the JICA Project Team)
Figure 2.3.3 Targeted Installed Capacity of Geothermal Power Plant
2.3.4 Superiority of Geothermal Power Generation
As mentioned in Section 2.2.4, the EEPCo master plan forecasts the electricity sales and peak demand
which greatly increase to 221,594 GWh and 25,761 MW, respectively, up to 2037 in the reference case.
Hydropower plants that will produce around 8,000 MW has been committed and under construction at
present, and will have the largest proportion in power development in the future. Meanwhile, even if all
geothermal resources with a total potential of 5,000 MW is developed in Ethiopia, it can only meet
around 25% of the entire energy requirement. As such, geothermal energy should be prioritized as the
base-load power for the following reasons:
(1) Energy Security
Geothermal is valuable pure-domestic energy as well as hydropower, and is very effective in terms of
energy security. By developing geothermal resources, it is possible to reduce the amount of fossil fuel
which is planned to be used for thermal power plants in the future.
(2) Energy Mix
At present, neither the Government of Ethiopia nor EEP have clear targets of energy mix. Electrical
supply will overly depend on hydropower generation from the present into the future (see Figure 2.3.4).
5 200
300500
700900
1200
1600
21002300
2500
2800
3100
3400
3700
4200
4600
5000
25 130330
610
0
1000
2000
3000
4000
5000
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
Proposed Installed Capacity of Geothermal Power Plant Committed Plant
Inst
alle
d C
apac
ity
(MW
)
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Geothermal, which will be next largest electrical source, is expected to be developed as much as
possible in order to improve the energy mix and mitigate risk in drought mentioned below.
Source: Ethiopian Power System Expansion Master Plan, EEPCo (arranged by the JICA Project Team)
Figure 2.3.4 Composition of Electrical Supply in EEPCo Master Plan
(3) Reliable Electrical Supply
Geothermal, which is not affected by climate change and weather condition, is extremely reliable energy,
that its load factor is as high as 80-90% worldwide. On the other hand, hydropower is exposed to large
drop of its available generation capacity in drought period as mentioned below. And wind and solar
power generation cannot be applied as base-load because their power generation is not stable due to
climate and weather condition. Moreover, in general, because wind farm needs same size of storage
battery or thermal power plant for back-up, its initial cost is expected to be double and more. Therefore,
geothermal, which is reliable and not affected by external condition, should be developed for base-load
in Ethiopia where a sufficient quantities of electricity is not supplied.
Source: JICA Project Team, based on demand curve provided by EEP
Figure 2.3.5 Schematic Image of Electrical Supply Composition against Electricity Demand in a day
90.6%
0.3%
3.8% 5.2%2012
Hydropower
Geothermal
Wind Thermal
Hydropower
Geothermal
Wind
81.3%
6.0%
5.7%
1.4%2.9%
2.6%
2025
Hydropower
Geothermal
WindThermal
SolarBiomass
60.4%16.8%
5.0%
1.0%
2.0% 14.8%
2037
HydropowerGeothermal
Wind
Thermal
Solar
Biomass
Total Capacity: 2,141 MW 10,630 MW 21,297 MW 30,248 MW
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(4) Mitigation of the Risk of Hydropower in Drought Season
Hydropower is exposed to large depression of power generation in drought period, and available
generation capacity of hydropower plant in Ethiopia is assumed to decrease up to 80% of installed
capacity when drought occurs. The EEPCo master plan analyzed hydrological data for the past 45 years
and formulated the generation plan. However, it is concerned that larger scale of drought than the past
occurs with climate change in the future. To mitigate risk of hydropower, geothermal should be
developed as reliable base-load plants.
(5) Reduction of Cost for Diesel Power Plants/Surplus Fossil Fuel Export
As mentioned above, diesel power plant mainly belonging to the CSC has been operated, and thermal
power plants such as gas turbine, combined cycle gas turbine (CCGT), and diesel power plants are
proposed to be installed from 2018 in EEPCo master plan. By developing geothermal which can replace
fuel and is pure-domestic energy, it is possible not only to save the high cost of diesel power generation
but to reduce the usage of fossil fuel and export the surplus fuel to other countries.
(6) Greenhouse Gas Mitigation
As shown in Figure 2.3.6, geothermal power generation emits less amount of CO2 among other
renewable energies and is very environmental-friendly power generation method. Therefore,
geothermal should be developed also for the reason of prevention of a global warming. Furthermore,
selling the electricity produced by geothermal to neighboring countries contributes to suppress the CO2
emission in East-Africa region.
Source: E. Imamura and K. Nagano, Central Research Institute of Electric Power Industry, Japan, July 2010
Figure 2.3.6 CO2 Emission by Energy
943
738
474
38 25 20 13 110
200
400
600
800
1000
(g‐CO2/kWh)
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CHAPTER 3 GEOTHERMAL POTENTIAL SURVEY
3.1 Geology
3.1.1 Tectonics
The study area belongs to the African Rift. The African Rift is
connected from Afar Triple Junction (see Figure 3.1.1) and
continues in the SW-SSW direction across the eastern African
countries of Djibouti, Eritrea, Ethiopia, Kenya, Uganda, and
Tanzania.
Generally, the valley is characterized by the geological
occurrence of active faults, active volcanoes, and hot springs,
which indicates a geothermal area. Geophysical and petrologic
data show that the lithosphere is thinning due to the intrusion of
hot mantle below the valley.
The valley is considered to be a separation boundary of the
African Plate. The eastern plate is called the Somalian Plate and
the western plate is the Nubian Plate. Both plates are
separating at a speed of 5 mm/year (Stamps et al., 2008).
3.1.2 Regional Geological Setting
The study area belongs to the central-southern part of the Main Ethiopian Rift (MER). MER has been
developed since Oligocene until Quaternary. During that period, major volcanic episodes are
recognized in Oligocene, middle Miocene, late Miocene, early-middle Pleistocene, and Holocene
(WoldeGabriel et al., 1990). The abstract is as follows:
The oldest volcanic activities are basalt and rhyolite flows exposed in and around the rift margins (e.g.,
Blue Nile gorge) during Oligocene, which formed lava plateau in the surrounding area. By middle
Miocene time, the rift was formed in some parts with containment basaltic flows. During Pliocene, a
huge pyroclastic flow covered the northern part of the study area. This characteristic pyroclastic flow
deposit is currently observed at a depth of around 2,100 m in the basin floor by geothermal well,
which indicates a minimum of 2 km of downthrown in the rift basin since its eruption (WoldeGabriel
et al., 1990, WoldeGabriel et al., 2000).
During Pleistocene, Wonji Fault Belt (WFB), which is the main spreading axis of MER, is formed at
the rift floor, and floor basalt and rhyolite are erupted along WFB. The volcanic activities are
characterized by peralcaline fissure basaltic eruptions and rhyolitic eruptions which formed volcanoes
and calderas. MER was formed as a symmetrical depression zone during this period and many lakes
appeared and disappeared due to the obstruction of volcanic deposits and/or climate change.
Source: http://people.dbq.edu/faculty /deasley/ Essays/EastAfricanRift.html
Figure 3.1.1 Distribution of the African Rift Valley
Afar Triple Junction
PROJECT AREA
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3.1.3 Regional Geological Structure
The MER was created by a complex system of NE-SW trending tensional faults, cut by a more recent
system of NNE-SSW trending faults known as Wonji Fault Belt.
The rift is connected from Afar Depression in the north, and
continues to symmetrical grabens at the center. The
continuation of the rift is distinctive near the border between
Ethiopia and Kenya, wherein small asymmetrical basins are
formed. Finally, the rift is connected to the Kenya Rift which
has a N-S direction.
The initial stage of MER formulation is closely related to the
Red Sea and the Aden Sea. During Mesozoic time,
north-central MER was bulged considering the thickness of the
Mesozoic sediments in Kella (North of Butajira) and Blue
Nile gorge.
In Oligocene, large and huge volcanic activity created lava
plateau. In early Miocene, three radial rifts might have
occurred in the plateau. After that, two rifts were spread and
downthrown to the sea, which became the Red Sea and the
Aden Sea. The other rift did not spread well and became MER.
Such kind of tectonic activity is considered to occur in the initial stage when the continent is apart, and
is caused by the rising of hot plume from the mantle (Figure 3.1.2).
Structural and stratigraphic relations of volcanic rocks along both rift escarpments of MER indicate a
two-stage rift development. The early phase started during late Oligocene-early Miocene time and was
characterized by a series of alternating and opposed half grabens. The half grabens evolved into a
symmetrical rift during the late Miocene period. The area also was characterized by active rifting
during Plio-Pleistocene, wherein around 2,000 m of subsidence was estimated (WoldeGabriel et al.,
1990).
Nowadays, the rift floor is covered by lakes, lacustrine sediments, alkali basalts from fissure eruptions,
volcanic ash deposits, and NNE-SSW faulting activities by WFB. These strata are classified as Wonji
Group in Figure 3.1.1.
(Source: http://www3.interscience.wiley. com:8100/legacy/college/levin/0470000201/chap_tutorial/ch07/chapter07-1.html)
Figure 3.1.2 Schematic Diagram for Development of the Red Sea Rift, the Aden Sea Rift, and the Failed African Rift (MER)
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Table 3.1.1 Stratigraphy of Main Ethiopian Rift (MER)
(Source: JICA Study Report, 2011)
3.2 Collection of Existing Information
3.2.1 Objective
All the existing geological papers, articles, and reports were collected for each geothermal site as the
background information for this Project. This information was reviewed based on the stage of
geothermal development as follows:
3.2.2 Regional Reports
Some basic and comprehensive geological investigations were carried out from the early 70s to 80s for
the purpose of exploring natural resources and geothermal development. Comprehensive
investigations and researches were conducted by the United Nations Development Programme
(UNDP) in 1973, the Ministry of Mines in 1984, and Electroconsul/Geothermica in 1987, and most of
the prospective geothermal areas were determined. Furthermore, these investigations summarized that
Aluto and Tendaho sites have the highest potential of all the prospective geothermal sites in Ethiopia.
Age(Ma)
WoldeGabriel et al.(1990) EWTEC (2008) Halcrow (2008)
Holocene0.0117
2.58
5.33 Butajira Ignimbrites
Guraghe Basalts
Shebele Trachytes
Neog
ene
Paleo
gene
Period/EpochQu
atern
ary
Pleistcene
Nazareth GroupPliocene
Miocene
23.03
Oligocene
33.9
Kella Basalts
Wonji Group
Chilalo Trachytes
Nazret Group/Afar Group
"Ancher Basalts", "ArbaGuracha Silicics"
A laji Formation
"Ancher Basalts", "ArbaGuracha Silicics"
Wonji Group
Chilalo Trachytes
Wonji Group
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3.2.3 Detailed Geothermal Survey
Detailed surveys have been conducted since the 1980s at most of the sites. These surveys consisted of
detailed geological survey (incl. geological mapping), geochemical survey/analysis, and geophysical
prospecting (MT/TEM survey). The status of surveys at each site is shown in Table 3.2.1.
Table 3.2.1 Status of Detailed Survey at Each Site
No.
Geothermal Sites Geological
Survey Geochemical
Survey Geophysical Prospecting
Other Surveys
1 Dallol ☑ ☑ -
2 Tendaho-3 (Tendaho-Allalobeda)
☑ ☑ ☑
3 Boina ☑ ☑ - 4 Damali ☑ ☑ - 5 Teo ☑ ☑ - 6 Danab ☑ ☑ - 7 Meteka ☑ ☑ - 8 Arabi - ☑ - 9 Dofan ☑ ☑ -* 10 Kone ☑ - - 11 Nazareth ☑ ☑ ☑ 12 Gedemsa ☑ ☑ -* TG well 13 Tulu Moye ☑ - - 14 Aluto-2 (Aluto-Finkilo) ☑ ☑ -* TG well 15 Aluto-3 (Aluto-Bobesa) ☑ ☑ -* 16 Abaya ☑ ☑ - 17 Fantale ☑ ☑ - Magnetic Survey 18 Boseti ☑ ☑ - 19 Corbetti ☑ ☑ ☑ 20 Aluto-1 (Aluto-Langano) ☑ ☑ ☑ 21 Tendaho-1 (Tendaho-Dubti) ☑ ☑ ☑
22 Tendaho-2 (Tendaho-Ayrobera)
☑ ☑ ☑ Radon Survey
☑: done, - : not done, -*: to be done, TG Well: Thermal Gradient well Note: The sites having limited data, are also classified as “done”. Source: JICA Project Team
It was confirmed that at least the detailed geological survey and geochemical survey were done at each
site. However, the quality and quantity of the results are not unified, e.g., entire site was not covered,
location of geological manifestations was not shown, or location of sampling was not shown.
3.2.4 Feasibility Study
Feasibility (or pre-feasibility) study was conducted at Tendaho-1 (Tendaho-Dubti), Tendaho-2
(Tendaho-Ayrobera), and Aluto-1 (Aluto-Langano) geothermal sites. In 1986,
Electroconsul/Geothermica conducted geothermal reservoir evaluation, design of facilities, and
economical evaluation, by drilling nine wells at Aluto-Langano. In 1996, the Ethiopian Institute of
Geological Survey (former GSE)/Aquater conducted geothermal reservoir evaluation by drilling three
wells at Tendaho-1 (Tendaho-Dubti) and Tendaho-2 (Tendaho-Ayrobera). Afterward, GSE continued
the drilling of three wells by themselves from 1995 to 1998.
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3.2.5 Geothermal Plant Construction /Operation and Maintenance
The first geothermal power plant was constructed at Aluto-1 (Aluto-Langano) in 1992, based on the
above feasibility study. Some reports were issued for operation and maintenance of geothermal wells
after the power plant construction.
3.3 Satellite Data Analysis
3.3.1 Objectives
Prior to the field survey, alteration zoning, mineral and lithological mapping, topographic
interpretation, and geological structure analysis were carried out using satellite images for the purpose
of obtaining data of the geothermal potential in the study area. Field survey was conducted based on
the results of the satellite data analysis and review of existing reports.
3.3.2 Methodology
For the remote sensing data, Japanese satellite products, namely, ASTER L3A and PALSAR L1.5, were
used. ASTER is an optical sensor which has visible and near infrared (VNIR) bands, short wavelength
infrared (SWIR) bands, and thermal infrared (TIR) bands as multi bands sensor (14 bands) and high
resolution (15-30 m). PALSAR is an active microwave sensor, which is not affected by weather
conditions and operable during both daytime and nighttime and has L band of multi polarization and
high resolution (15-30 m). ENVI (Ver. 5.0) software of ESRI, USA was mainly used for the processing
and analysis of satellite data.
In ASTER data analysis, the band composite image and the band ratio image are created by using SWIR
bands and the apparent distributions of various alteration zones are detected. Rock facies and mineral
mapping and interpretation of geological structures are conducted. In PALSAR data analysis, the mosaic
image of geothermal development sites is created and extraction of geological structures of lineament is
conducted.
In the analysis of ASTER image, vegetation, water, cloud, and shadow of cloud areas where data
analysis is impossible are masked. Then, the band composite images, displaying band 4 as red color,
band 6 as green color, and band 8 as blue color, are created. After calculating the band ratios between
bands, the band ratio images, displaying band 4/band 6 as red color, band 5/band 6 as green color, and
band 5/band 8 as blue color, are created. By analyzing these images, extraction of the apparent
distribution of various alteration zones, rock facies and mineral mapping, and geological structure
analysis are conducted. In the band composite image (RGB=B4, B6, B8), advanced argillic alteration
including alunite and kaolinite mainly shows peachy color; phyllic alteration including sericite mainly
shows yellowish color; and propylitic alteration including chlorite and epidote mainly shows greenish
color. In the band ratio image (RGB=B4/B6, B5/B6, B5/B8), advanced argillic alteration shows reddish
color and propylitic alteration shows purplish red color ~ deep bluish color.
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As mentioned above, using ASTER data makes it easy to identify the distribution of various
hydrothermal alteration zones. However, whether these zones include apparent distribution has to be
considered.
PALSAR data, which are synthetic aperture radar data, are useful to grasp topography and ground
surface condition. In PALSAR data analysis, the mosaic images are created by using ortho-corrected
level 1.5 products of HH single polarized wave. From these images, lineament, fault cliff, crater, caldera,
lava dome, and lava flows are extracted. In PALSAR image, outcrops of mountain range show texture of
topography with sharp edge. In and around survey areas, it is interpreted that the topography and
geological structure have NNE-SSW direction, which is clearly the same as the East African Rift, as
great geological structure. The secondary sediment areas are classified by tone according to sediment
type (difference of roughness) and texture. It is inferred that the diameter of gravel is small and
roughness is small in dark colored areas. On the contrary, in bright areas, the diameter of gravel and
roughness are large. Although the secondary sediment areas which show large roughness have the same
tone as the outcrops of mountain range, it is possible to distinguish them by texture.
3.3.3 Results
In the analysis of the ASTER data, the band composite images, which have band 4 as red color, band 6 as
green color, and band 8 as blue color, and the band ratio images, which have band 4/band 6 as red color,
band 5/band 6 as green color, and band 5/band 8 as blue color, were created. The band ratio images of
several areas are shown in the Attachment 2.1 to 2.5..
In the analysis of the PALSAR data, PALSAR mosaic images were created from HH single polarized
wave data and are shown in the Attachment 2.6 to 2.10.
The integrated analysis of GIS, where the results of ASTER DEM data were compiled as well as the
results of the ASTER and PALSAR data analysis, was conducted. As a result, the outcrop distributions
of altered rocks were extracted and geological structures were interpreted. The results will be reflected
in the next field survey as reference. The results of each site are as follows:
(1) From Dallol Site to Boina Site
In one area in the northwest region and three areas in the southeast region of Dallol site, the distributions
of hydrothermal alteration are shown and aligned in the NW-SE direction. There are lots of volcanic
topographies and circle structures lining toward the NW-SE direction. In the central region of Boina site,
small hydrothermal alteration is shown northwest of the caldera. There is a zonal distribution of volcanic
topographies and circle structures in the NW-SE direction at the western side of the caldera.
(2) Arabi Site
In Arabi site, there is zonal distribution of a lot of small volcanic topographies and circle structures in
the EW direction, accompanied by several small hydrothermal alterations in various places.
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(3) Northern Sites (Tendaho Site ~ Meteka Site)
In and around Tendaho-3 (Tendaho-Allalobeda) site, there are no obvious hydrothermal alterations.
Many lineaments in the NW-SE direction are in the southwest side. In and around Dubti site, there are no
obvious hydrothermal alterations. As unconsolidated sediments largely cover the ground surface, there
is no lineament. In and around Tendaho-2 (Tendaho-Avrobeda) site, there are a lot of parallel lineaments
in the NW-SE direction clearly in the western side of the site. A line of volcanic topographies and circle
structures in the NW-SE direction is in the northern side of the site and the distribution of hydrothermal
alteration is shown in the central part of the site. In the central part of Meteka site, several small
distributions of hydrothermal alteration are on the mountain body. From the central part to the southern
side, there are comparatively large circle structures. In the northern side, there are some small circle
structures and volcanic topographies. The distribution of hydrothermal alteration is shown in the
western side of the mountain body.
(4) Central Sites (Dofan Site ~ Tulu Moye Site)
In the central part of Boseti site, small circle structures and volcanic topographies are in the center of the
mountain body. Toward the southwest direction, there is a line of some circle structures. Around the end
of that line, volcanic structures are largely distributed. The small distributions of hydrothermal alteration
are at the western end and northeastern end of the mountain body. At the eastern end of the site, there is
a zonal distribution of volcanic topographies in the NE-SW direction. There are lots of lineaments in the
NE-SW and NNE-SSW directions. From the central part and to the western part of Gedemsa site, there
is a large circle structure. Inside the large circle structure, there are some small circle structures and
volcanic topographies which overlap with the distributions of hydrothermal alteration. There are many
lineaments in the NNE-SSW direction outside of the large circle structure. Especially, there are clear
lineaments at the eastern end of the large circle structure.
(5) Southern Sites (Aluto Site ~ Abaya Site)
In Aluto-1 (Aluto-Langano) site, there is no distribution of hydrothermal alteration. There are some
circle structures at the northeast and southwest ends of the site. No lineament is in the site. In Aluto-2
(Aluto-Finkilo) site, one small distribution of hydrothermal alteration is in the central part of the site. No
lineament is in the site. In Aluto-3 (Aluto-Bobesa) site, there is no distribution of hydrothermal
alteration. In the western part, outside the site, there are circle structures and volcanic topographies.
There is no lineament in the site and many lineaments in the NE-SW direction are in the west, outside
the site.
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3.4 Results of the Field Survey and Laboratory Analysis
3.4.1 Geological Survey
(1) Objectives
This site reconnaissance was conducted for the following purposes:
i) Confirmation of geology (Topography, rocks, structures, and alteration zones: supplemental
survey for existing site survey result);
ii) Confirmation of alteration zones which were determined by remote sensing; and
iii) Taking samples for rocks and alteration minerals.
(2) Methodology
(i) Site Survey The site reconnaissance was conducted in two stages, which are called the second and third site
reconnaissance in the study. Detailed survey points were selected based on the existing data,
results of remote sensing, and hearing from local residents. In the third site reconnaissance, the
Dallol and Arabi areas were investigated on April 30, 2014 by GSE experts only for security
reasons. The sites of the second and third site reconnaissance were as shown in Table 3.4.1.
Table 3.4.1 Schedule of Site Survey
Period Target Site Remarks
From: 17th Jan 2014 To: 1st Feb 2014 (Second site reconnaissance)
- Aluto-1 (Aluto-Langano) - Aluto-2 (Finkilo) - Aluto-3 (Bobessa) - Gedemsa - Nazreth (Boku, Sodore) - Boseti - Kone
The survey was jointly conducted by GSE and the JICA Project Team
From: 4th Apr 2014 To: 17th Apr. 2014 (Third site reconnaissance)
- Dofan - Meteka - Tendaho-1 (Dubti) - Tendaho-2 (Ayrobera) - Tendaho-3 (Allalobeda) - Seha, Lake Loma (Tendaho) - Boseti (Supplemental)
The survey was jointly conducted by GSE and the JICA Project Team
From: 1st May 2014 To: 18th May 2014 (Third site reconnaissance)
- Dallol - Arabi
The survey was conducted by GSE
(Source: JICA Project Team)
(ii) Geological Analysis The samples taken during site reconnaissance were analyzed by x-ray fluorescence (XRF) for
determining rock composition and by x-ray diffraction (XRD) for determining alteration
minerals.
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Table 3.4.2 Methodology of Geological Analysis
Type of Samples Analysis Method Objective
Rock Samples XRF Composition of Rock (%) (SiO2, Al2O3, CaO, MgO, Na2O, K2O, Cr2O3, TiO2, MnO, P2O5, SrO, BaO)
Alteration Minerals
Zeolite and Others
XRD (powder specimen)
Determination of alteration mineral
Clay Minerals
XRD (oriented specimen)
Determination of clay mineral
- Treated by Ethylene Glycol
- Treated by HCl
Identification of clay minerals (Chlorite- Kaolinite, Chlorite- Smectite)
(Source: JICA Project Team)
(3) Results
The results of the geological survey are as follows:
(i) Site Survey Results The second and third site reconnaissances have been conducted The results of the site reconnaissance
are summarized by the following items as shown in Table 3.4.3.
i) Topography and route map
ii) General geology
iii) Geological structure, fault, and others
iv) Geothermal manifestation
v) Alteration
vi) Photos and others
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Table 3.4.3 Example of Site Reconnaissance Sheet
Site No. 2 Site Name: Tendaho-3 (Tendaho-Allalobeda) Regional State: Afar Satellite Imagery and Route Map
Legend Surveyed Route
Fumarole
Hot Spring
Other Geological Feature
Center Coord. (WGS84) Lat: N 11038’34.29” Lon: E41000’58.70” Surveyed Date: 12 April, 2014 by Google Earth Pro: http://www.google.com/earth
General Geology The site is located at the western edge of Manda- Hallaro Graven. Layered basalt and andesite lava of Afar Stratoid are observed (1-4Ma, by V. Accolela et.al. (2008))
Photos
Overview
Geological Structure, Fault and Others The site is located along NW-SE marginal fault of Manda- Halaro Graven, associated with minor faults. The height of fault scarp is approx. 200m.
Manifestation More than 20 hot springs and geysers are found along NW-SE marginal fault within 1 km diameter, showing definite relationship between the faults and manifestations. Whitish gray amorphous silica is deposited around the springs.
Geyser
Alteration No alteration was observed at the host rock.
Others Remote sensing result shows no indication of alteration; due to no alteration minerals were found.
0.5 km N
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(ii) Results of Laboratory Analysis (XRF and XRD) The results of the geological laboratory analysis (XRF and XRD) are shown in Table 3.4.4. The results
are as follows:
Result of XRF Analysis for Rock Composition
SiO2-K2O+Na2O Diagram (TAS Diagram)
SiO2-K2O+Na2O Diagram is commonly used for classifying rock series and type. Figure 3.4.1
shows the results of analysis for the project with the results of existing reports
(Electroconsult/Geotermica, 1987; UNDP, 1973).
Source: JICA Project Team
Figure 3.4.1 SiO2-K2O+Na2O Diagram (TAS Diagram)
The results are as follows:
Analyzed data were concordant with
the data in existing reports and showed
alkali rock series.
Figure 3.4.2 shows the same diagram
for Olkaria Geothermal Field in Kenya.
The composition of trachyte and
ryolite is similar to that of Olkaria. It is
considered that most of the target sites
in Ethiopia are geologically promising site
in the entire African Rift.
Source: J.K.Regat (2004)
Figure 3.4.2 SiO2-K2O+Na2O Diagram in Olkaria Geothermal Field in Kenya
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FeO-MgO-K2O+Na2O Diagram
FeO-MgO-K2O+Na2O Diagram is commonly used for the trend of magmatic segregation in rock
series. Figure 3.4.3 shows the results of analysis for the project with the results of existing
reports.
Source: JICA Project Team
Figure 3.4.3 FeO-MgO-K2O+Na2O Diagram
Analyzed data were concordant with the data in existing reports and almost all the samples
showed similar trends to that of tholeiitic series. It is considered that all the sites may have similar
characteristics such as depth of magma chamber, cooling velocity, and so on.
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Table 3.4.4 XRF Analysis Results
Source: JICA Project Team
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(iii) Result of XRD Analysis for Alteration Minerals Table 3.4.5 shows the results of determination of minerals by XRD.
Table 3.4.5 Mineral Occurrence by XRD
Source: JICA Project Team
According to the results of site reconnaissance, rock alteration was observed only around
geothermal manifestations. It was not observed in wider areas such as alteration zone, except for
Dofan and Meteka sites.
The above results shows that low-grade alteration has occurred in many sites, and is characterized
by the occurrence of Quartz, Opal-A, Opal-CT, Clinoptilorite, Halloysite, Smectite, which is
concordant with the site reconnaissance. The occurrence of kaolinite at Gedemsa and Finkilo sites
shows trace of hydrothermal alteration.
No. Site Location Sample Quartz Opal - CT Opal - A Clinoptilolite Kaolinite Halloysite Smectite
140119-02 Bobesa (Aluto-2) Bobessa Altered Clay △ +
140120-03A Bobesa Bobessa Altered Obsidian + - 140120-03B Bobesa Bobessa Zeolite + - 140120-04 Bobesa Bobessa Altered Rock - + 140120-05 Bobesa Bobessa Secondary Mineral + 140120-06 Bobesa Gebiba Clay Mineral + 140121-03 Finkilo (Aluto-3) Finkilo Yellow Tuff - - 140122-02 Finkilo Adoshe Yellow Clay + + 140122-03 Finkilo Adoshe Red Clay - - 140122-04 Finkilo Adoshe White Mineral ○ - 140122-05 Finkilo Humo Clay - + + 140122-06 Finkilo Humo White Mineral + 140122-07 Finkilo Shutie Clay △ + 140122-08 Finkilo Shutie White Mineral △ - 140125-01 Gedemsa Sambo Zeolite Vein - + + 140125-03 Gedemsa Sambo Altered Welded Tuff ○ 140125-04 Gedemsa Sambo White Mineral ○ + + 140126-01 Nazereth Boko Yellow Tuff △ ○ 140131-03 Boseti Kintano Altered Andesite - - 140131-04 Boseti Kintano White Mineral + +
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3.4.2 Geochemistry
(1) Objectives
The main objective of geochemical study is to characterize the geothermal reservoirs using geochemical
properties of fluid and gas collected from geothermal manifestations (hot springs and fumaroles). For
this reason, the study includes site reconnaissance of geothermal manifestations, measurement of the
location, temperatures, and other properties, and sampling of fluid and gas. The reservoir temperature
and origin of geothermal fluid and gas are interpreted based on the geochemical properties (chemical
and isotopic compositions) of the fluid and gas samples.
Some collected samples are analyzed by the JICA study team in Japan, and also by GSE at the GSE
laboratory. The analytical results are used to verify the analytical precision of GSE by comparing the
results of GSE and the JICA study team.
(2) Methodology
(i) Site reconnaissance Site reconnaissance was carried out in the second and third site reconnaissance survey. Because of
a security reason, Dallol, Arabi, and Erer areas were surveyed by only GSE members. The survey
areas are as follows:
The second site reconnaissance: Aluto, Bobesa, Finkilo, Gedemsa, Nazreth, Boseti, and Kone
The third site reconnaissance: Dofan, Meteka, Dubti (Tendaho-1), Ayrobeda (Tendaho-2),
Allalobeda (Tendaho-3), Seha, Lake Loma, Boseti (additional
survey), Dallol, Arabi, and Erer
The following operations were conducted on site.
1. Measurement of coordinate and altitude of geothermal manifestations (by using a portable
GPS navigator)
2. Observation of geothermal manifestations
3. On-site measurement of temperature, pH, and conductivity of geothermal manifestations,
river and lake water
4. Sampling of hot spring water, fumarolic gas, water and steam from geothermal wells, and
river/lake water.
The results of the site reconnaissance are summarized in Table 3.4.6 (the southwestern part of the
rift valley), and Table 3.4.7 (the northeastern part). The total survey locations are 71 points, from
which 41 samples (32 water and 11 gas samples) were collected.
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Source: JICA Project Team
Table 3.4.6 Summary of the site reconnaissance in the southwestern part of the Ethiopian Rift Valley
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Source: JICA Project Team
Table 3.4.7 Summary of the site reconnaissance in the northeastern part of the Ethiopian Rift Valley
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(ii) Sampling i) Hot spring water, water from geothermal wells, and river/lake water
Hot springs measuring the highest temperature and flow rate in the site were preferentially sampled.
At Shenemaya (Gedemsa) and Welenchiti (Boseti), water wells were sampled as a hot spring
because they showed higher temperature than the ground temperature. LA-6 and LA-8, which are
geothermal wells in the Aluto area, were also sampled as a representative of reservoir fluid.
Water sample was once put in a jug, and then transferred into polyethylene bottles that can be
tightly capped. Before the sampling, the jog and bottles were rinsed three times or more with
sample water. Sample water was divided into several bottles depending on the analytical
components and methods. The samples were pretreated with a proper amount of HCl (1:1) solution
for analysis of metal, ammonia, and silica, with cadmium acetate (5%) solution for hydrogen
sulfide, and with potassium hydroxide for carbon dioxide, respectively.
ii) Fumarolic gas and steam from a geothermal well
Fumaroles measuring the highest temperature and flow rate in the site were preferentially sampled.
At the Aluto area, steam from well LA-8 was sampled as a representative of reservoir steam
containing geothermal gas.
In the sampling for fumaroles, a funnel was put over a fumarole vent, and then sealed on its rim
with soil or mud to prevent air contamination during the sampling. After that, a rubber tube was
connected to the funnel in order to extract gas. As to a geothermal production well LA-8, a
sampling separator was connected to a sampling valve on the two-phase line, then a rubber tube
was connected to a nozzle of steam sampling valve on the separator. A sampling apparatus called
gas burette that was filled with an alkaline solution was connected to the rubber tube to introduce
the gas or steam into the gas burette. In the gas burette, CO2 and H2S were dissolved in the alkaline
solution, and residual gas (R gas) accumulated at the head of the gas burette. After collecting a
sample, R gas was transferred from the gas burette to a gas collector (a glassware), and then, the
alkaline solution was washed out into a measuring flask, and diluted to 250 ml with distilled water.
The diluted alkaline solution was divided into two polyethylene bottles dedicated to analysis of
CO2 and H2S, respectively. A cadmium acetate (5%) solution was added into the samples for H2S
analysis on site.
(iii) Analysis of samples Table 3.4.8 and Table 3.4.9 show analytical components and analytical methods, respectively.
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Table 3.4.8 Analytical components
Source: JICA Project Team
Table 3.4.9 Analytical methods
Source: JICA Project Team
(3) Results
(i) Profile of geothermal manifestations in the Ethiopian Rift ValleyLocation (coordinate), altitude, and temperature of survey points are summarized in Tables 3.4.6
and 3.4.7, and the distribution of temperature of geothermal manifestations is shown in Figure
3.4.4.
In the southwestern part of the Ethiopian Rift Valley, a main geothermal manifestation is fumarole
located in uplands. Fumaroles whose temperature is more than 90°C are located in Aluto, Bobesa,
and Gebiba; only the fumaroles in Gebiba show a boiling temperature in the southwestern part.
The other fumaroles are of lower temperatures (70-90°C) less than a boiling temperature. The low
temperature suggests that steam generated at a depth is cooled during its ascending to the surface
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by surrounding rock. In this cooling process, a part of the steam condensates into liquid (water),
resulting in a change of chemical composition from the original one controlled by the reservoir
temperature. Gas geochemical thermometers thus cannot be applied to the low-temperature
fumarolic gases.
Source: JICA Project Team
Figure 3.4.4 Distribution of geothermal manifestations in the Ethiopian Rift Valley
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Hot springs are distributed mainly in lowlands around Langano Lake and the Nazareth area. Their
temperatures are middle to low, ranging from 65° to 35°C, and boiling spring cannot be found.
Relatively high temperatures are 65°C of Ouitu (Langano lake) and 50°C of Sodere (Nazareth).
In the northeastern part of the Ethiopian Rift Valley, fumaroles and hot springs are distributed in
upland and lowland areas. The manifestations show temperatures higher than those in the
southwestern part. Fumaroles with temperatures higher than 90°C are located in Dofan, Dubti,
Ayrobeda. In Dubti and Ayrobeda, temperatures of fumaroles are slightly higher than a boiling
temperature. Hot springs distribute in Dofan, Meteka, Allalobeda, Seha; there are hot springs with
the temperature higher than 80°C, except for Dofan. A boiling hot spring is located at Allalobeda.
Taking a wide view of the Ethiopian Rift Valley, Aluto-Langano and Tendaho (Allalobeda,
Ayrobeda, Dubti, Seha) are the remarkable sites showing prominent activity of geothermal
manifestations.
(ii) Results of analysis of samples The analysis results of chemical and isotopic compositions are shown in Table 3.4.10 for water
and Table 3.4.11 for gas. Geochemical characteristics of geothermal water and gas are examined
with those results and reference data. The reference data are taken from Aquater (1980, 1991),
ELC/Geotermica (1987), Gonfiantini et al. (1973), UNDP (1973, 1976, 1977), Panichi (1995),
D'Amore et al, (1997). For description of the locations of sampling points, the survey areas are
divided into four major regions; they are, along a direction from southwest to northeast in the rift
valley, [1] Lake District (Abaya to Wonji), [2] Southern Afar (Fantale to Meteka), [3] Northern
Afar (Teo/Danab to Tendaho), and [4] Danakil Depression (Dallol).
(iii) Origin of geothermal fluid Origin of geothermal fluid (water from geothermal wells and hot springs) is examined using the
relationship between δD and δ18O. As shown in Figure 3.4.5, waters from the geothermal
manifestation, rivers, and lakes are plotted close to the meteoric water line, which means that
meteoric water is the origin of the geothermal waters. Much higher isotopic values in both oxygen
and hydrogen are seen in Figure 3.4.5, indicating isotopic mass fractionation caused by intense
evaporation (see the evaporation line in the figure) in the rift valley as mentioned by Panichi
(1995).
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Source: JICA Project Team
Table 3.4.10 Results of chemical and isotopic analysis for water samples
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Source: JICA Project Team
Table 3.4.11 Results of chemical and isotopic analysis for gas samples
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Source: JICA Project Team
Figure 3.4.5 Relationship between δD and δ18O of geothermal and surface waters
(iv) Characteristics of main anions in geothermal water Relative concentrations of main anions (Cl, SO4, HCO3) are shown in Figure 3.4.6 (based on
Giggenbach, 1991). This figure illustrates that the anion composition of waters from geothermal
wells and hot springs differs by the sample locations; the geothermal waters in Lake District and
Southern Afar are rich in HCO3, on the contrary, the geothermal waters in Northern Afar are rich
in Cl. The Cl-rich waters in Northern Afar are similar to those from geothermal systems
developed in subduction zones (see mature waters in the figure). Water samples of Meteka and
Arabi show intermediate relative concentration of HCO3 and Cl. Dallol in Danakil Depression
has extremely high concentration of Cl and extremely low pH (Cl 197000 mg/l, pH < 1 in Table
3.4.10). This suggested that the chemistry of Dallol hot spring is strongly affected by volcanic
HCl gas.
In Lake District, waters are rich in HCO3 among surface water (river and lake), hot spring, and
geothermal well discharges. This observation indicates that the anion composition of the surface
water is unchangeable in the geothermal reservoir where the surface water penetrates.
Giggenbach (1991) states that HCO3-rich waters are found at margins of a thermal area in the
geothermal systems developed close to the subduction zones. The observation in Lake District,
however, indicates that HCO3-rich water can be reservoir water in the southwestern part of the
Ethiopian Rift Valley.
Looking at Figure 3.4.6(b) closely, geothermal wells in Aluto and hot springs in its neighboring
area, Langano, together show very similar anion composition. This similarity demonstrates that
the geothermal fluids from Aluto and Langano are originated in a single geothermal system. This
point of view is used to estimate reservoir temperature as mentioned later.
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Source: JICA Project Team
Figure 3.4.6 Relative Cl, SO4, and HCO3 contents of geothermal and surface waters on weight basis
In Tendaho, Northern Afar, unlike Aluto-Langano, geothermal waters and river waters are quite
different in anion composition, which could be caused by the different condition in water-rock
interaction. As can be seen in Figure 3.4.5, geothermal waters in Tendaho demonstrate the oxygen
shift with which geothermal water becomes rich in heavy oxygen isotope compared to surface
(recharge) water as a result of water-rock interaction. Those observations of the anion and
isotopic composition in Northern Afar and Aluto-Langano indicate that the water-rock interaction
is probably progressed more in Northern Afar.
(v) Estimation of reservoir temperature based on geochemical thermometers In order to estimate the progress of water-rock interaction, Na-K-Mg diagram (Giggenbach,
1988) is drawn in Figure 3.4.7. This figure implies that waters from geothermal wells in Tendaho
and hot springs in Allalobeda is fully equilibrated with surrounding rock, which is consistent with
the fact that the geothermal waters are rich in Cl and affected by oxygen shift in the isotopic
composition. On the contrary, waters from geothermal wells in Aluto and hot springs of Oiutu in
Langano are partially equilibrated with surrounding rock and the other hot spring waters are
immature in the state of water-rock interaction. In some cases, geochemical thermometers using
Na and K are unreliable where it is applied to the waters that are not fully equilibrated with the
reservoir rock (Giggenbach, 1991). Reservoir temperature, therefore, can be examined by
comparison among several geochemical thermometers including quartz thermometer in this study.
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Source: JICA Project Team
Figure 3.4.7 Relative Na, K, and Mg contents of geothermal waters
Table 3.4.12 summarizes the results of calculation of geochemical thermometers using the
chemical compositions obtained in this work. These results are compared with geochemical
temperatures calculated for the reference chemical data, and temperatures obtained in well
loggings (Seifu, 2006; D'Amore et al., 1997) as shown in Figures 3.4.8 and 3.4.9. These figures
provide observations as follows: [1] the quartz thermometer shows a good agreement with
well-logging temperatures of geothermal wells (LA-6, LA-8, TD-1, TD-2, TD-4), [2]
temperatures calculated with the quartz thermometer converge within a narrow range in each
survey site, so that the quartz temperatures can be recognized as a representative one of the hot
spring aquifer. In contrast, the calculation results using Na-K and Na-K-Ca thermometers vary
widely within the each site. [3] Geochemical temperatures of hot springs, except for quartz
temperatures of Allalobeda, are lower than those of geothermal wells. [4] There is no a single
trend in the orders of temperatures between quartz and Na-K/Na-K-Ca temperatures throughout
the all survey sites.
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Source: JICA Project Team
Table 3.4.12 Calculated results of geochemical thermometers for geothermal waters
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Source: JICA Project Team
Figure 3.4.8 Comparison of temperatures calculated with geochemical thermometers for the southwestern part of the Ethiopian Rift Valley
Source: JICA Project Team
Figure 3.4.9 Comparison of temperatures calculated with geochemical thermometers for the northeastern part of the Ethiopian Rift Valley
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Based on the conditions above, no geochemical temperature of hot spring can directly indicate
plausible reservoir temperature. For this reason, we estimate reservoir temperature with the
assumption in which Aluto-1 (Aluto-Langano) can be treated as a single geothermal system
including a geothermal reservoir and hot spring aquifer, and conditions described above in [1] and
[2]. In the process of estimation, it is assumed that the temperature difference between the
geothermal reservoir and hot spring aquifer is represented by the deference in quartz temperature
between a geothermal well and an Oiutu hot spring. In order to estimate a reservoir temperature,
this temperature difference will be added to the quartz temperature of hot springs equally in each
site. The temperature difference was calculated to be 70°C by subtracting the quartz temperature
of the Oiutu hot spring from that of LA-8, which indicates an intermediate temperature among the
geothermal wells in Aluto. This manner follows a principle taking a uniform process to estimate
reservoir temperatures throughout the survey sites.
Gas geochemical thermometers can also be used for fumarolic gas to estimate reservoir
temperature. However, in the Ethiopian Rift Valley, gas thermometers is considered unreliable
because most of the fumaroles have temperatures less than a boiling temperature, and contain air
in a large proportion. For this reason, gas geochemical thermometers were applied to the
calculated gas chemical compositions corrected for mixing of air. As shown in Table 3.4.13, the
calculation results of gas thermometers show a wide variety of temperatures with no tendency,
which indicates that the use of gas thermometers should be avoided for estimation of the reservoir
temperature, and that geochemical thermometers using water composition is more practical for
the purpose.
Table 3.4.13 Calculated results of geochemical thermometers for geothermal gases
Source: JICA Project Team
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The estimated reservoir temperatures, which were calculated by adding the temperature
difference (70°C) between the geothermal reservoir and hot spring aquifer to the quartz
temperatures of hot springs, are shown in Table 3.4.14. For the sites where no chemical data of
hot springs are available, the estimated reservoir temperatures are assumed to be the same as
those of a neighboring site. On the basis of this estimation of reservoir temperatures, the
temperature conditions were eventually arranged for practice of a volumetric method to assess the
geothermal potential. In this condition setting, distribution density and activity of geothermal
manifestations including fumaroles as well as hot springs are considered. The final conditions of
the reservoir temperature are expressed by the four classes of temperature ranges, as follows (see
also Figure 3.5.2): A: 240°C–290°C, B: 210°C–260°C, C: 170°C–220°C, D: 130°C–170°C.
Table 3.4.14 Estimation of ranges of reservoir temperature for a volumetric method
Source: JICA Project Team
(vi) Relationship between the origin of geothermal gas and heat source The origin of geothermal gas can be interpreted from chemical and noble gas isotopic
compositions (Table 3.4.11) of gas samples. Figure 3.4.10 depicts He-Ar-N2 relative
concentration of gases along with the end members mentioned in Giggenbach (1966). Figure
3.4.10(a) plots analytical raw data. Gas from a geothermal well (LA-8), fumaroles having
temperatures higher than a boiling temperature (Gebiba, Ayrobeda, Dubti), and bubbling gas in a
Meteka hot spring are plotted close to a mixing line of Air-saturated water and a mantle
component. The largest mixing ratio of the mantle component is seen in the gas from LA-8, so
that the composition probably represents a gas composition in the geothermal reservoir. From
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these observations, it can be inferred that an origin of the gas is emanation gas from the mantle
beneath the rift valley. On the other hand, gas samples form fumaroles with lower temperature
(Boko, Boseti, Bobesa, and Dofan) are abundant in the air component, which could be gained by
the fumarolic gas ascending through an unsaturated layer above a water label. Figure 3.4.10(b)
uses calculated gas chemical compositions corrected for air mixing, and reveals the mantle
component signature in such low-temperature fumarolic gases from Boko and Bobesa.
Source: JICA Project Team
Figure 3.4.10 Relative He, Ar, and N2 contents of geothermal gases
The Mantle component in geothermal gas can be confirmed by noble gas isotopic ratio as inferred
by the relationship between 3He/4He and 4He/20Ne with end members of air, crust, and mantle
(Leśniak et al, 1997) in Figure 3.4.11. In the figure, geothermal gases in the Ethiopian Rift Valley
are plotted close to the mixing line connecting the mantle and air components, which means that
the geothermal gas contains emanation gas from the mantle.
The Great Rift Valley, where the upwelling movement of mantle splits the crust underneath, is
supplied with a large quantity of heat from the mantle. The mantle component in geothermal gas,
thus, can be an indicator for the mantle or magma generated from the mantle as the heat source.
Furthermore, the movement of the gas indicates a flow path running from a depth to the surface,
that is, a fracture zone. Because supply of meteoric (ground) water into the fracture zone develops
a geothermal reservoir there, it can be said that the obvious contribution of the mantle component
in the geothermal gas on the surface indicates a highly potential geothermal reservoir at a depth.
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Source: JICA Project Team
Figure 3.4.11 Relationship between 3He/4He and 4He/20Ne of geothermal gases
(vii) Verification of chemical analysis quality of GSE In order to verify the precision of chemical analysis at GSE, GSE and the JICA study team
analyzed shared water samples, and compared the both results. For a practical comparison of the
results, samples were selected from a wide variety of concentration of chemical components. The
selected samples were of LA-8, Oiutu #2, Oiutu #84, Shenemaya, Sodere, Gergedi (6 samples).
As shown in Figure 3.4.12, the comparison of the results between GSE and the JICA study team
are summarized as below.
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Source: JICA Project Team
Figure 3.4.12 Comparison of analytical results between GSE and the JICA study team
Good agreement between GSE and the JICA study team can be seen in the analysis results of pH, EC (electric conductivity), Cl, SO4, HCO3, F, Na, and K, except for SO4 of LA-8, which proves sufficient analytical precision of GSE.
A large difference is found in a high concentration of SiO2. A cause for the difference might be a lack of digesting of polymerized silica in the process of analysis at the GSE laboratory. Because SiO2 concentration is frequently used in geochemical thermometers, improvement of SiO2 measurement is the highest priority for GSE.
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Although there is no large difference in K concentrations between GSE and the JICA study team, a slight deference can be found in the high concentration of LA-8. Because K is an important component used in geochemical thermometers together with Na, it is preferable for GSE to improve the analytical precision of K in high concentration.
GSE's analytical precision is insufficient for Ca and Mg. A solution to this problem is use of ICP atomic emission spectroscopy. GSE possesses an ICP spectrometer, but it is not operated. Use of this ICP spectrometer with proper maintenance would lead to a significant improvement in analysis of Ca and Mg. In addition, the ICP spectrometer can analyze many other elements, so that the spectrometer will enhance the capacity of GSE in chemical analysis.
Considering the conditions above, the top priority in the chemical analysis at the GSE laboratory is to
achieve sufficient analytical precision for a high concentration of SiO2 and K. For this reason, in the
training course for GSE in Japan, engineers were trained in SiO2 measurement with spectrophotometry,
and Na and K with flame atomic emission spectroscopy. These methods are simple and required
apparatus is relatively inexpensive, so that the employment of these methods is effective in capacity
building of the GSE laboratory.
3.5 Preliminary Reservoir Assessment
3.5.1 Objectives
The preliminary geothermal reservoir source assessment was conducted to facilitate the results to use
as basic information for formulating Master Plan on Geothermal Energy Development.
3.5.2 Definition of Resource and Reserve
For the evaluation of potential in the oil industry, the potential is classified into “resource” and
“reserve” in accordance to the project stage and economics. For geothermal projects, there are lots of
studies that try to classify “resource” and “reserve” based on a similar concept. However, no
universally recognized standards exist for classifying and reporting geothermal “resources” and
“reserves”. For this study, the geothermal resource was described according to the definition of
Australian Geothermal Energy Group Geothermal Code Committee (AGRCC) in the “Geothermal
Lexicon For Resources and Reserves Definition and Reporting Edition 2 (2010)”. This definition is the
most distinct for resource evaluation at the early stage among similar studies according to the
International Energy Agency (IEA)’s comparative study. The conceptual model of this definition is
shown in Figure 3.5.1.
The code recognizes three categories of geothermal “resources”, namely: “inferred”, “indicated”, and
“measured”, which represent three different levels of geological knowledge and probability of
occurrence. Two categories of “reserves” are recognized (“probable” and “proven”), based upon the
likelihood and reliability of the modifying factors and the type of resource. The modifying factors
depend on economic, environmental, and political context, and assess the commerciality of the
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“resources”.
Source: AGRCC, 2010
Figure 3.5.1 Relations of Geothermal Sources, and Geothermal Reserves
The Federal Democratic Republic of Ethiopia’s Scaling-Up Renewable Energy Program Ethiopia
Investment Plan (Draft Final) shows that the planning aspects of geothermal projects consist of: (i)
review of existing information on a prospect; (ii) detailed surface exploration (geology, geochemistry,
and geophysics); (iii) exploration drilling and well testing (minimum of three wells); (iv) appraisal
drilling (4-6 wells) and well testing; (v) feasibility studies; (vi) production drilling, power plant design,
environmental impact assessment, and reservoir evaluation; (vii) power station construction and
commissioning; and (viii) reservoir management and further development.
The comparison between these eight stages and AGRCC’s categories is shown in Table 3.5.1.
Table 3.5.1 Comparison between Eight Stages and AGRCC’s Categories
Eight Development Stages in Ethiopia AGRCC, 2010
Resource Reserve (i) Review of existing information on a prospect
Inferred - (ii) Detailed surface exploration (geology, geochemistry, and geophysics)
(iii) Exploration drilling and testing (minimum of three wells) Indicated Probable
(iv) Appraisal drilling and well testing (v) Feasibility studies
Measured Proven
(vi) Productive drilling, power plant design, EIA, and reservoir evaluation
(vii) Power station construction and commissioning
(viii) Reservoir management and further development
Source: JICA Project Team
According to the above comparison, the category of the survey sites is classified. There are no boring Nippon Koei Co., Ltd. JMC Geothermal Engineering Co., Ltd Sumiko Resources Exploration & Development Co., Ltd.
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holes drilled in the geothermal reservoir in the surveyed sites except Aluto and Tendaho. Therefore,
the geothermal resources of all other sites are classified under “inferred resources”. For Aluto-1
(Aluto-Langano) and Tendaho-1(Tendaho-Dubti) sites, there are boring holes drilled already that
increased geological knowledge and confidence. Therefore, these two sites are classified as “indicated
resource” and/or “measured resource”.
3.5.3 Methodology of Reservoir Resource Assessment – Volumetric Method
The Volumetric method is used for the reservoir resource assessment. The method was introduced by
USGS (1978) for a rapid assessment. The method assumes the following conditions. 。
• Geothermal heat energy is stored or confined in a reservoir that has a finite volume under the ground;
• The outer limits of the reservoir are defined with parameters obtained by explorations. The outer limits shall be within reachable realm with current or near-future technology;
• The stored heat energy is recovered to the ambient as a form of geothermal fluid. The fluid is recharged from outside of the reservoir;
• The heat is not replenished to the reservoir from outside of the reservoir. • The reservoir resource assessment is conducted in such a way that the heat energy is
constantly recovered for the period of the plant life time; the heat energy will suddenly run out at the end of the plant life time; total recovered heat energy (kJ) is calculated and then converted to the power capacity (MW) of the power plant.
• In this regards however, recovery factor is considered in the calculation since not all the heat energy is recovered to the ambient.
The equations proposed by USGS (1978) are as follows
)( refrr TTCVq −= ρ [kJ] (1)
rWHg qqR = [ - ] (2)
)( refWHWHWH hhmq −= [kJ] or [kW] (3)
(for a geothermal reservoir temperature > 150 ºC )
[ ])( 000 ssThhmW WHWHWHA −−−= [kJ/s] or [kW] (4)
)/(FLWE uAη= [kJ/s] or [kW] (5)
qr :heat energy of the reservoir q_WH :heat energy at well heat Tr :reservoir temperature Tref :reference temperature
T0 :rejection temperature (Kevin)
m_WH :mass of geothermal fluid at wellhead
h_WH :specific enthalpy of fluid at wellhead
href:specific enthalpy of fluid at reference temperature h0:specific enthalpy of fluid at rejection temperature
s_WH :specific entropy of fluid at wellhead s0 :specific entropy of fluid at rej ection temperate ρC :volumetric specific heat of the reservoir V :reservoir volume Rg :recovery factor WA :available energy (exergy energy) E :plant capacity F :plant factor( 90% ) L :plant life time( 30year)
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However, the USGS calculation method has appeared not to be prevailing in references, partially
because that the equation (4) includes rT dependent parameters ( WHh and WHs ) that render the
calculation with probabilistic approach complicated and that the equation (4) shall be the equation (4)’
when used with the equation (1), (2) and (3).
[ ]}{(}){( 0)00 ssThhhmW refSWHrefWHWHA −−−−= − [kJ] or [kW] (4)’
It is noted that if all the recovered heat at the wellhead is to be cast directly into a flash cycle, then
)( refWH hh − = WHh )0( =refh with the condition that the final state of the recovered geothermal fluid is
defined at the condenser of the rejection temperature (T0); since the enthalpy of water is defined as zero at the triple point, i.e. 0=refh , then refT =0.01 ºC for the equation (1), (2), (3) and (4)’.
Instead, the following equation has been used in many references.
)/()( FLTTCVRE refrcg −= ρη [kJ/s] or [kW] (6)
Where ηc is conversion factor.
Unreasonably higher temperatures such as 150 ºC or 180 ºC or others have been used as the reference
temperature, though rational reasons have appeared not to be given; the reasons on why and/or the
conversion factor is selected have appeared either to be provided. Hence, it appears not to be appropriate
to use such equation for the assessment of the reservoirs in Ethiopia.
Instead, the JICA Team herein use a rational and practical calculation method for the assessment of
reservoir with temperature not less than 180 ºC shown below. The detailed explanation of this
explanation has been provided in a paper attached as Appendix.
)()(ζ FLTTCVRE refrgex −= ρη [kJ/s] or [kW] (7)
ffrr CCC ρϕρϕρ +−= )1( [kJ/s] or [kW] (8)
Where ηex is exergy efficiency, ζ is “heat allocation function”, φ is porosity of the reservoir rock mass, ρr is density of the
reservoir rock, Cr is the specific heat of the reservoir rock, ρf is density of fluid in the void of the rock mass, and Cf is the
specific heat of the fluid in the void of the rock mass, Tref =0.01 ºC(triple point).
With the typical conditions that the separator temperature and the condenser temperature are 151.8 ºC
and 40 ºC respectively, the heat allocation function ζ is given below.
4591082158.00046543806.00000124900.00000000127.0ζ 23 −+−= rrr TTT (9)
The exergy efficiency has been calculated for the case of separator temperature = 151.8 ºC and
condenser temperature = 40 ºC based on the data of actually operating power plant all over the world.
Note that this exergy efficiency is different from that of the utilization factor of the USGS and the
conversion factor of the prevailing method.
ηex= 0.77 ± 0.05 (9)
Recovery factor is as given below.
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Rg= 0.05 – 0.20 (10)
Note that this calculation method gives similar results to the ones calculated by the USGS method, thus
the validity has been confirmed.
In addition, when reservoir temperature is estimated below 180, binary system is assumed. For this case,
the equation (5) was used with the parameters of ηc=0.05-0.08, Tref=80 ºC.
3.5.4 Probabilistic Approach - Monte-Carlo Method
As a probabilistic approach, the Monte Carlo method was used. The soft-weir was the Cristal Ball of
Oracle Company. The calculation conditions are given in the table below.
Table 3.5.2 Parameters for reservoir assessment
Parameter Symbol Unit Range Probabilistic
distribution Min. M.L Max.
Volume V m3 0 tbp tbp Triangle
Reservoir temperature Tr ºC tbp tbp tbp Triangle
Rock density ρr kg/m3 - 2600 - fixed
Rock volumetric specific heat Cr kJ/kg - 1.0 - fixed
Fluid volumetric density ρ f kg/m3 - 950 - fixed
Fluid specific heat Cf kJ/kg - 5 - fixed
Porosity Φ % 5 - 10 Uniform
Recovery factor Rg % 5 20 Uniform
Reference temperature for flash type Tref ºC - 0.02 - fixed
Rejection temperature (condenser temperature) *
T0 ºC - 40 - fixed
Separator temperature* - ºC - 151.8 - fixed
Exergy efficiency for flash ηex % 72 77 82 Triangle
Reference temperature for binary type Tref ºC - 80 - fixed
Conversion factor for binary ηc % 5 6.5 8 Triangle
Plant factor F % - 90 - fixed
Plant life L year - 30 - fixed
Min.: Minimum; Max.: Maximum, M.L.: Most likely; tbp: to be proposed; *: given in the heat allocation function
Source: JICA Project Team
3.5.5 Proposed the parameters
There has not been much information to determine the necessary parameters for the volumetric method.
Hereunder described explanations on how the essential parameters have been proposed for future
reviews as development states should proceed.
3.5.6 Proposal of the reservoir volumes
In most of the target geothermal sites, surface geological and geochemical surveys only were conducted.
Under this circumstance, reservoir volumes were determined with the following procedures. Table 3.5.3
shows a summary of the procedure.
The target sites were grouped into three categories (i.e. volcano type, caldera type and
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graben type) based on the satellite image analysis and site survey; Maximum plane area of each site was first determined. Most likely plane area of each site then was determined with reference to the existing
survey information of Aluto-Langano, Tendaho-Dubti and Corbetti, where MT/TEM survey was already conducted;
The most likely plane area determined above was adjusted to accommodate field conditions in accordance with intensity of geothermal manifestations and/or fractures.
Minimum plane area is assumed as zero.
Table 3.5.3 Determination of Plane Area of Geothermal Reservoir
Typical Landform
Volcano Type Caldera Type Graben Type
1) Site
Dallol, Boina, Damali, Meteka (Ayelu and Amoissa), Dofan, Tulu Moye, Aluto (Langano, Finkilo, Bobesa), Abaya, Fantale, Boseti
Gedemsa, Kone, Nazareth, Corbetti
Tendaho-Allalobeda, Tendaho-Ayrobeda, Tendaho-Dubti, Teo, Danab, Meteka, Arabi, Butajira
2) Maximum area of reservoir
Area of volcanic body Inner area of calderaArea of geothermal manifestations in graben structure
3) Most likely area 20% of Maximum Area 15% of Maximum Area
100% of Maximum Area(Manifestation Area)
4) Site specific bonus point
+ 20% Alteration Bonus+20% Manifestation Bonus+ 20% Fracture Bonus(where observed)
+ 20% Alteration Bonus+ 20% Manifestation Bonus+ 20% Fracture Bonus(where observed)
+ 20% Alteration Bonus+ 20% Manifestation Bonus+ 20% Fracture Bonus(where observed)
5) Minimum area
zero zero zero
ReferencesMT/TEM Result at Aluto-Langano MT/TEM Result at Corbetti MT/TEM Result at Tendaho
Source: JICA Project Team
3.5.7 Determination of Reservoir thickness
The parameters shown in the Table 3.5.4 were assumed.
Table 3.5.4 Determination of Geothermal Reservoir Thickness
Items Minimum MaximumMost
ProbablyNotes
Depth to Reservoir top(GL-)
0.5 km 1.0 km 0.8 km Existing information was referred to for “most probably” determination
Depth to Reservoir bottom (GL-)
3.0 km 3.0 km 3.0 km -A depth economically reachable by the present or near future technology
Reservoir Thickness 2.5 km 2.0 km 2.2 km -
Source: JICA Project Team
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3.5.8 Determination of Average Reservoir Temperatures
The reservoir average temperatures were proposed in Table 3.5.5 based on the geochemical assessment
conducted by the Master Plan Project.
Table 3.5.5 Average Reservoir Temperatures
Class Min Max Most
Probably Remarks
Class A 240 290 265 6 sites (Tendaho and Aluto) Class B 210 235 260 7 sites (Boseti, Meteka, etc.) Class C 170 220 195 7 sites (Nazareth, Arabi, etc) Class D 130 170 150 2 sites (Gedemusa and Kone)
Source: JICA Project Team
3.5.9 Geothermal Power Plant Type Assumed
It was assumed that single flash power plant for average reservoir temperature not less than 200 ºC and
binary power plant for average reservoir temperature less than 200 ºC. The Class C geothermal reservoir
includes both temperature categories above 200 ºC and below 200 ºC. For such case, a flash type power
plant was selected from a practical and economical point of view, by assuming that 40% of the
geothermal reservoir would be above 200 ºC. There will be possibilities that double flash type or
Flash/binary combined type may be adopted. However, there will not be sufficient information to
examine such possibilities at this stage; and possible increment due to those option will be minimal
compared to cost impact, thus those examination was not included in this assessment.
Source: JICA Project Team
Figure 3.5.2 Average Reservoir Temperature and Power Plant Type
3.5.10 Results of reservoir assessment
The assessment results are shown in Table 3.5.6.
The assessment resulted that the most likely value (‘mode’ in statistic term) is 4,200 MW, value at
occurrence probability 80% is 2,000 MW and the value at occurrence probability is 11,000 MW. There
12 geothermal prospects that may have resources more than 100 MW. It is noted that this calculation
results provided the resource estimation of “Inferred level” in principle. However, the total calculation
result (91 MW) of Aluto-1 (Langano) will include 70 MW of ‘Indicated Resource’ and 5 MW of
‘Measured Resource’, because 70 MW has been estimated by a numerical simulation and 5 MW is the
Temperture
Class A
Class B
Class C
Class D
Calculation
100 150 200 250 300
Binary Single Flash
100%
100%
40%
100%
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power output of the pilot plant. Similarly, 10 MW of (Indicated resource) that was estimated by a
Pre-feasibility Study (2014) is included in 290 MW of Tendaho-1 (Dubti).
Table 3.5.6 Resource assessment
Unit: MW Target Site
Site No. Cumulative
probability 80% Most Probable
(mode) Cumulative
probability 20% 19 Corbetti 480 960 2400 16 Abaya 390 790 1900 13 Tulu Moye 202 390 1100 18 Boseti 160 320 800 21 Tendaho-1 140 290 660 4 Damali 120 230 760 7 Meteka 61 130 290 2 Tendaho-3 64 120 320
17 Fantale 64 120 320 14 Aluto-2 58 110 290 22 Tendaho-2 47 100 230 3 Boina 56 100 350
20 Aluto-1 49 91 180 9 Dofan 41 86 200
15 Aluto-3 23 50 110 1 Dallol 23 44 120
12 Gedemsa 20 37 100 11 Nazreth 17 33 100 10 Kone 7 14 42 6 Danab 6 11 30 5 Teo 4 9 23 8 Arabi 4 7 36
New/ Divided Site 7-2 Meteka-Ayelu 47 53 250 7-1 Meteka-Amoissa 28 89 150 23 Butajira 6 16 30
Total 2114 4200 10791
Updated After MT/TEM Survey (See Chapter 7)
18 Boseti 175 265 490 22 Tendaho-2 120 180 320
(based on proposed calculation method)
Source: JICA Project Team
As a reference, the calculation results using the prevailing calculation method in Table 3.5.7. The
calculation was conducted with ‘conversion factor = 0.13 – 0.16” and ‘Reference temperature=150 ºC’.
If the reference temperature should be 180 ºC, the results will be approximately 20% less than those
results.
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Table 3.5.7 Comparison of the results of the Prevailing method and Proposed method
Source: JICA Project Team
OccurrenceProbability 80%
Most likely(mode)
OccurrenceProbability 20%
OccurrenceProbability 80%
Most likely(mode)
OccurrenceProbability 20%
19 Corbetti 480 960 2400 1.12 1.08 1.4116 Abaya 390 790 1900 1.11 1.05 1.4613 Tulu Moye 201.5 390 1100 1.03 0.93 1.5518 Boseti 160 320 800 1.23 1.14 1.7021 Tendaho-1 140 290 660 1.52 1.66 1.354 Damali 120 230 760 1.50 1.53 1.777 Meteka 60.7 130 290 1.12 1.08 1.452 Tendaho-3 63.5 120 320 1.09 1.00 1.39
17 Fantale 63.6 120 320 1.20 1.09 1.6014 Aluto-2 57.8 110 290 1.18 1.10 1.4522 Tendaho-2 47.3 100.4 230 1.10 1.06 1.443 Boina 55.7 100 350 1.33 1.25 1.59
20 Aluto-1 49.4 91.1 180 1.41 1.32 1.157-1 Meteka-Amoissa 27.9 88.9 150 0.65 1.33 1.25
9 Dofan 40.8 86.1 200 1.32 1.35 1.607-2 Meteka-Ayelu 46.5 53.4 250 2.21 1.16 3.2915 Aluto-3 23.1 49.5 110 1.10 1.18 1.171 Dallol 22.6 44 120 1.13 1.07 1.48
12 Gedemsa 19.5 36.6 100 1.00 1.00 1.0011 Nazreth 17.3 32.7 100 1.00 1.00 1.0023 Butajira 5.7 16.35 30 1.00 1.00 1.0010 Kone 7.3 13.7 42 1.00 1.00 1.006 Danab 5.9 11.4 30.2 1.18 1.04 1.445 Teo 4.4 8.6 22.6 1.00 1.08 1.418 Arabi 3.8 6.9 36.1 1.27 0.86 1.57
total 2114.3 4199.65 10790.9 1.17 1.12 1.48
Proposed/PrevailingPrevailing method
Site No.
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ρr(kg/m3) Cr(KJ/Kg℃) ρf(kg/m3) Cf(KJ/Kg℃) φ(%) Rg(%) F(%) L(years)2600 1 950 5 5~10 5~20 0.9 30
Most LikelyArea (km2)
Manifestation
Alteration Fracture
Temperature(ABCD)
Minimum+manifestation,Alteration andFractures bonus
Remarkable:increase%
Remarkable:increase%
Remarkable:increase%
Maximum (=ShallowCase)
Minimum (=Deep Case)
Most Likely
10 Kone D 6.40 4.80 24.10 24.10 0.00 3.60 9.60 0 0 0.2 0.5 1 0.8 3 2.5 2 2.2 170 130 150
11 Nazareth C 6.00 4.80 22.60 22.60 0.00 3.40 9.00 0 0 0.2 0.5 1 0.8 3 2.5 2 0.88 220 170 195
12 Gedemsa D 8.80 6.60 45.60 45.60 0.00 6.80 36.50 0.2 0.2 0.2 0.5 1 0.8 3 2.5 2 2.2 170 130 150
19 Corbetti B 10.10 15.10 119.80 119.80 0.00 18.00 71.90 0.2 0 0.2 0.5 1 0.8 3 2.5 2 2.2 260 210 235
1 Dallol B 3.00 2.60 6.10 6.10 0.00 1.20 3.10 0.2 0 0 0.5 1 0.8 3 2.5 2 2.2 260 210 235
3 Boina C 11.60 9.20 83.80 83.80 0.00 16.80 25.10 0 0 0 0.5 1 0.8 3 2.5 2 0.88 220 170 195
4 Damali C 16.00 14.50 182.20 182.20 0.00 36.40 54.70 0 0 0 0.5 1 0.8 3 2.5 2 0.88 220 170 195
7-2 Meteka-Ayelu C 8.80 7.80 53.90 53.90 0.00 10.80 27.00 0 0 0.2 0.5 1 0.8 3 2.5 2 0.88 220 170 195
7-3 Meteka-Amoissa C 9.10 8.50 60.70 32.50 0.00 6.50 16.30 0 0 0.2 0.5 1 0.8 3 2.5 2 0.88 220 170 195
9 Dofan B 7.50 6.00 35.30 35.30 0.00 7.10 31.80 0.2 0.2 0.2 0.5 1 0.8 3 2.5 2 2.2 260 210 235
13 Tulu Moye C 20.00 15.00 235.60 235.60 0.00 47.10 117.80 0 0 0.2 0.5 1 0.8 3 2.5 2 0.88 220 170 195
14 Aluto-2 (Aluto-Finkilo) A 4.30 2.72 11.70 11.70 0.00 2.30 5.90 0.2 0 0 0.5 1 0.8 3 2.5 2 2.2 290 240 265
15 Aluto-3 (Aluto-Bobesa) A 2.30 1.50 3.45 3.50 0.00 0.70 3.20 0.2 0.2 0.2 0.5 1 0.8 3 2.5 2 2.2 290 240 265
16 Abaya B 12.50 12.50 122.70 90.00 0.00 18.00 63.00 0.2 0 0.2 0.5 1 0.8 3 2.5 2 2.2 260 210 235
17 Fantale C 11.00 7.30 63.10 63.10 0.00 12.60 44.20 0.2 0 0.2 0.5 1 0.8 3 2.5 2 0.88 220 170 195
18 Boseti B 8.40 6.70 44.20 44.20 0.00 8.80 22.10 0 0 0.2 0.5 1 0.8 3 2.5 2 2.2 260 210 235
2Tendaho-3 (Tendaho-Allalobeda)
A 1.72 0.97 1.30 13.00 0.00 1.30 6.50 0.2 0 0.2 0.5 1 0.8 3 2.5 2 2.2 290 240 265
5 Teo B 0.50 0.30 0.12 1.20 0.00 0.12 0.60 0.2 0 0.2 0.5 1 0.8 3 2.5 2 2.2 260 210 235
6 Danab B 0.70 0.30 0.16 1.60 0.00 0.16 0.80 0.2 0 0.2 0.5 1 0.8 3 2.5 2 2.2 260 210 235
7 Meteka B 2.30 0.80 1.40 14.00 0.00 1.40 9.80 0.2 0.2 0.2 0.5 1 0.8 3 2.5 2 2.2 260 210 235
8 Arabi C 1.90 0.60 0.90 9.00 0.00 0.90 0.90 0 0 0 0.5 1 0.8 3 2.5 2 0.88 220 170 195
21Tendaho-1 (Tendaho-Dubti)
A 3.00 1.00 2.40 24.00 0.00 2.40 16.80 0.2 0.2 0.2 0.5 1 0.8 3 2.5 2 2.2 290 240 265
22Tendaho-2 (Tendaho-Ayrobera)
A 1.30 0.80 0.82 8.20 0.00 0.82 5.70 0.2 0.2 0.2 0.5 1 0.8 3 2.5 2 2.2 290 240 265
(23) Butajira B 1.20 0.70 0.66 6.60 0.00 0.66 3.30 0.2 0 0.2 0.5 1 0.8 3 2.5 2 2.2 260 210 235
MT 20 Aluto-1 (Aluto-Langano) A 2.55 1.18 3.01 6.00 1.05 - 4.80 0.2 0.2 0.2 0.5 1 0.8 3 2.5 2 2.2 290 240 265
Vo
lcan
o t
yp
e
Minimum(℃)
Gra
ben
Ty
pe
MostLikely(℃)
Cal
der
a T
yp
e
Reservoir Temperature Type No Site name20%
(Volcano),15%
(Caldera) ofMaximum
Inner Dia.(Long: km)
Length ofmajor axis(GrabenType:km)
Inner Dia(Short: km)
Length ofmino axis(GrabenType: km)
Area(km2)
MaximumArea (km2)
MinimumArea (km2)
Upper Depth(- km from surface)
BottomDepth (- kmfromsurface)
MaximumThickness(km)
Area of Reservoir (km2) Thickness of Reservoir (km)MinimumThickness(km)
Most LikelyThickness(km)
Maximum(℃)
Table 3.5.8 Parameters Used for Reservoir Resource Assessment
Source: JICA Project Team
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(References)
Aquater, 1980. Geothermal resources exploration project- Tendaho area. Feasibility study- phase ii.
Final report.
Aquater, 1991. Teodaho geothermal study project: Geothermal study of the Dubti and Allallobeda
geothermal areas in the Tendaho graben (Ethiopia).
Arnórsson, S., 2000. The quartz and Na/K geothermometers. I. New thermodynamic calibration, World
Geothermal Congress, 929-934.
Arnórsson, S., Gunnlaugsson, E., Svavarsson, H., 1983. The chemistry of geothermal waters in Iceland.
III. Chemical geothermometry in geothermal investigations. Geochimica et Cosmochimica
Acta 47(3), 567–577.
Australian Geothermal Energy Group Geothermal Code Committee, 2010. Geothermal Lexicon For
Resources and Reserves Definition and Reporting
Caroline Le Tuldu, Jean-Jacques Tiercelin, Elisabeth Gibert, Yves Travi, Kiram-Eddine Lezzar,
Jean-Paul Richert, Marc Massault, Francoise Gasse, Raymonde Bonnefille, Michiel Decobert,
Bernard Gensous, Vincent Jeudy, Endale Tamrat, Mohammed Umer Mohammed, Koen
Martens, Balemwal Atnafu, Tesfaye Chernet, David Williamson, Maurice Taieb, 1999. The
Ziway-Shala Lake basin system, Main Ethiopian Rift: Influence of volcanism, tectonics and
climatic forcing on basing formation and sedimentation. Palaeogeography, Palaeoclimatorogy,
Palaeoecology Vol. 150, p135-177.
Colin F. Williams 2004. Development of revised techniques for Assessing Geothermal Resources
D'Amor, F. and Panichi, C., 1980. Evaluation of deep temperature of hydrothermal systems by a new gas
geothermometer. Geochimica et Cosmochimica Acta. 44(3), 549–556.
D'Amore, F., Giusti, D., and Gizaw, B., 1997, Geochemical assessment of the Northern Tendaho Rift,
Ethiopia. Proceedings of 22nd Workshop on Geothermal Reservoir Engineering Stanford
University, Stanford, CA, USA, January 27-29, 1997, SGP-TR-155, 435-445.
EIGS-IAEA Project, ETH/8/003, Reports.
ELC/Geotermica Italiana, 1987. Geothermal reconnaissance study of selected sites on the Ethiopian rift
system: Fluid geochemical report.
Fournier, R.O., Truesdell, A.H., 1973. An empirical Na–K–Ca geothermometer for natural waters.
Geochimica et Cosmochimica Acta 37(5), 1255–1275.
Fournier, R. O., 1979, Revised equation for the Na/K geothermometer. Transactions - Geothermal
Resources Council, 3, 221-224.
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Giday WoldeGabriel, James L. Aronson, Robert C. Walter, 1990. Geology, geochronology, and rift basin
development in the central sector of the Main Ethiopia Rift. Geological Society of America
Bulletin Vol. 102, p439-458.
Giggenbach, W. F., 1988, Geothermal solute equilibria. Derivation of Na-K-Mg-Ca geoindicators.
Geochimica et Cosmochimica Acta, 52, 2749 - 2765.
Giggenbach, W. F., 1991. Chemical techniques in geothermal exploration. Application of geochemistry
in geothermal reservoir development(coordinator D’ Amore, F., Ed.). UNITAR/UNDP Centre
on Small Energy Resources, Rome., 119-144.
Giggenbach, W.F., 1996. Chemical composition of volcanic gases, in: R. Scarpa, R., and Tilling, R.I.
(Eds.), Monitoring and Mitigation of Volcano Hazards. Springer, pp. 221 – 256.
Gioia Falcone, 2013. Classification and Reporting Requirements for Geothermal Resources
Gizaw, B., 1989. Geochemical investigation of the Aluto-Langano geothermal field, Ethiopian rift
valley. M. Phil., University of Leeds, England, 1-237.
Gonfiantini R., Borsi, S., Ferrara, G., and Panichi, C. , 1973. Isotopic composition of waters from the
Danakil depression (Ethiopia). Earth and Planetary Science Letters 18(1), 13-21
Hot Dry Rocks Pty Ltd, 2013. Global Review of Geothermal Reporting Terminology
Japan International Cooperation Agency, 2011. The Study on Groundwater Resources Assessment in the
Rift Valley Lakes Basin in the Federal Democratic Republic of Ethiopia, Final Report.
K.C. Lee, 1996. Classification of Geothermal Resources – An Engineering Approach
Leśniak, P. M., Sakai, H., Ishibashi, J., and Wakita, H., 1997, Mantle helium signal in the West
Carpathians, Poland. Geochemical Journal, 31, 383-394.
Malcolm A. Grant. Paul F. Bixley 2011. Geothermal Reservoir Engineering Second Edition
Malcolm A Grant 2014. Stored-heat assessments: a review in the light of field experience
Panichi, C., 1995, IAEA Report of an expert mission, Isotopic investigation in geothermal hydrology,
Project No. ETH/8/003.
P. Muffler – R. Cataldi 1977. Methods for Regional Assessment of Geothermal Resources
Seifu, A., 2006, Aluto Langano well status, Go devil and Kuster K10 logs results, 33p.
Subir K. Sanyal, 2005. Classification of Geothermal Systems – A Possible Scheme
UNDP, 1973. Geology, geochemistry and hydrology of hot spring of the east African rift system within
Ethiopia. UNDP Technical Report, New York.
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UNDP, 1976. Geochemical investigation in the Lakes District and Afar of Ethiopia. UNDP Report.
UNDP, 1977. Isotopic geochemistry and hydrology of geothermal areas in Ethiopian rift valley.UNDP
Technical Report.
USGS Circular 790 1978. Assessment of Geothermal Resources of the United States
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CHAPTER 4 ENVIRONMENTAL AND SOCIAL CONSIDERATIONS
4.1 Outline of Environmental and Social Impact Assessment Study
The Environmental and Social Impact Assessment (ESIA) study was conducted to evaluate potential
environmental impacts due to the geothermal energy development at Initial Environmental Examination
(IEE) level with a comparison of several alternatives. Outline of the ESIA study is as follows.
4.1.1 Tasks of ESIA Study
The ESIA Study consists of the following six main tasks.
(1) Baseline survey (collection and compilation of readily available data and information, and
literature review);
(2) Study on alternative plans applying the concept of strategic environment assessment (SEA)
for the 16 candidate sites mentioned below;
(3) Scoping of the environmental impacts caused by the Project activities;
(4) Prediction and assessment of natural and socio-environmental impacts caused by the Project
in the level of initial environmental examination (pre-IEE);
(5) Mitigation and monitoring plan study; and
(6) Stakeholders’ meeting.
4.1.2 Objectives of ESIA Study
The main objectives of the ESIA Study are as follows:
- To collect natural and social environmental baseline information in order to identify and
assess the potential impacts caused by the Project.
- To identify and assess potential impacts on the social/natural environment and pollution
caused by the Project, and to prepare the management and monitoring plan for necessary actions
toward the potential environmental and social impacts as well as to proposed mitigation
measures.
The main point of the ESIA Study is to collect and compile the environmental-related data and
information in and around the Project sites which enable the JICA Project Team to prioritize the
candidate sites for the geothermal plant development.
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4.1.3 Area Covered in the ESIA Study
The study area for the ESIA Study shall cover areas affected by the Project including power
transmission line where differs by item of environmental and social considerations. The Project
includes sixteen (16) target sites in total selected by JICA Study Team and GSE from twenty two (22)
candidate sites shown in Table 4.1.1.
Table 4.1.1 The Target Sites
No. Geothermal Sites Group Site Survey 1 Dallol
Gro
up-2
GSE 2 Tendaho -3 (Allalobeda) JICA 3 Boina GSE 4 Damali (Dam Ali) GSE 5 Teo GSE 6 Danab GSE 7 Meteka JICA 8 Arabi GSE 9 Dofan
Gro
up-1
JICA 10 Kone JICA 11 Nazareth JICA 12 Gedemsa JICA 13 Tulu Moya - 14 Finkilo (Aluto 2) JICA 15 Bobesa (Aluto 3) JICA 16 Abaya - 17 Fantale
Add
ition
al
- 18 Boseti JICA 19 Corbetti - 20 Aluto-1 - 21 Tendaho-1 (Dubti) - 22 Tendaho-2 (Ayrobera) JICA
JICA: The sites where JICA Study Team undertook the site survey. GSE: The sites where GSE undertook the site survey due to access and/or security issues.
Source: JICA Study Team
Among the above 22 sites, the sites from #01 to #16 are included the RD (11 June 2013), the sites from
#18 to #22 are newly included in the Master Plan Formulation project as a result of IC/R meeting held on
14th October 2013 at GSE head office and other follow-up meeting.
4.2 Environmental Laws and Regulations
4.2.1 Framework of environmental and social laws and regulations
Ethiopia adopted its Constitution in 1995, which provides the basic and comprehensive principles and
guidelines for environmental protection, and management. The concept of Sustainable Development
and Environmental Rights are enshrined in Articles 431, 442 and 923 of the Constitution of FDRE4.
Based on the Constitution, several laws and regulations which concern the development of geothermal
energy have been enacted. Among these laws and regulations, “Environmental Impact Assessment
1 Article 43: the Right to development, 2 Article 44: Environmental Rights, 3 Article 92: Environmental Objectives
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Proclamation no. 299/2002” (EIA Proclamation) and “Environmental Pollution Control Proclamation
no. 300/2002” are the most concerned proclamations applicable to the development of geothermal
energy. The EIA Proclamation provides EIA with mandatory legal prerequisite for the implementation
of major development projects, programs and plans. This proclamation is a proactive tool and a
backbone to harmonizing and integrating environmental, economic and social considerations into a
decision making process in a manner that promotes sustainable development. The Environmental
Pollution Control Proclamation was promulgated with a view to eliminate or, when not possible to
mitigate pollution as an undesirable consequence of social and economic development activities. This
proclamation is one of the basic legal documents, which need to be observed as corresponding to
effective EIA administration.
As for the framework of resettlement and land acquisition issue, the Constitution (1995) provides basic
policy on the private asset and its compensation. “Expropriation of Landholding for Public Purposes and
Payment of Compensation Proclamation, Proclamation No. 455/2005” and “Payment of Compensation
for Property Situated on Landholdings Expropriated for Public Purposes, Council Ministers Regulation
No. 135/2007” provide the detail procedure such as expropriation process and compensation standard.
Major Regulations, Guidelines and Proclamations applicable to the geothermal energy development
project are listed in Table 4.2.1 below. The contents of listed regulations are summarized in Appendix
4.1.
Table 4.2.1 Major Regulations, Guidelines and Proclamations Applicable to the Geothermal Energy Development Project
No. Title No. Date of Issue 1 Environmental Impact Assessment Proclamation 299 31 Dec, 2002 2 Environmental Pollution Control Proclamation 300 03 Dec, 2002 3 Environmental Protection Organs Establishment Proclamation 295 31 Oct, 2002
4 Expropriation of Landholdings for Public Purposes and Payment of Compensation Proclamation
455 15 Jul, 2005
5 Rural Land Administration and land Use Proclamation, Proclamation 456 15 Jul, 2005 6 Ethiopian Water Resource Management Proclamation 197 Mar, 2000 7 Solid Waste Management Proclamation 513 12 Feb, 2007 8 Environmental Impact Assessment Procedural Guideline Series 1 Nov, 2003
9 Draft EMP for the Identified Sectoral Developments in the Ethiopian Sustainable Development & Poverty Reduction (ESDPRP)
01 May, 2004
10 Investment Proclamation 280 02 Jul, 2002
11 Council of Ministers Regulations on Investment Incentives and Investment Areas Reserved for Domestic Investors
84 07 Feb, 2003
12 The FDRE Proclamation, “Payment of Compensation for Property Situated on Landholdins Expropriated for Public Purposes”
455 2005
13 Council of Ministers Regulation, “Payment of Compensation for Property Situated on Landholdins Expropriated for Public Purposes”
135 2007
14 Oromya Regional Administration Council Directives, “Payment of Compensation for Property Situated on Landholdins Expropriated for Public Purposes” 5 2003
15 Investment (Amendment) Proclamation 373 28 Oct, 2003
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(1) Environmental Impact Assessment
1) Laws and regulations relating to EIA in Ethiopia
In order to manage and avoid and/or minimize negative impacts on the natural and social environment
with the implementation of various development projects as well as to promote positive impacts, EIA
has been developed. Its use has been adopted into planning regulations in a number of countries
including Ethiopia. The EIA Proclamation no. 299/2002 aims to ensure that environmental impact
assessment is used to predict and manage the environmental effects of development activities resulting
from their design, citing, installation and operation. EIA is a law-based procedure, and the EIA
Proclamation no. 299/2002 and “Environmental Impact Assessment Procedural Guideline Series 1,
November 2003” issued by the EPA have made EIA procedures compulsory5 to obtain approval for
major development projects. According to the EIA Procedural Guideline, projects are categorized into
three schedules:
Schedule-1: Projects, which may have adverse and significant environmental impacts and therefore
require a full Environmental Impact Assessment.
Schedule-2: Projects whose type, scale or other relevant characteristics have potential to cause some
significant environmental impacts but are not likely to warrant a full EIA study.
Schedule-3: Projects which would have no impact and do not require an EIA.
Projects for geothermal power plant fall under the schedule I activities.
Development activities such as geothermal resource development to be designated by directive require,
before their implementation, the authorization of the EPA, in case of projects that are licensed by the
Federal Government or where they would be likely to have trans-regional environmental impact.
Regional environmental agencies have that authority in the case of projects that are licensed at the
regional level. The authorization would be based on an Environmental Impact Study (EIS) provided by
the project proponent. The EIS is required to meet requirements specified by the EPA directive as to the
issues to be addressed. Project owners are required to consult with the communities likely to be affected
by the project.
2) EIA Process
The general description of the EIA process and the permit requirements are detailed in the EIA
Procedural Guideline Series 1 of the FDRE. As per the Guidelines, it involves sufficient information that
enable the determination of whether and under what conditions the project shall proceed. Thus, as a
minimum, the following descriptions shall be presented:
5 Appendix 1 of the EIA Procedural Guideline Series 1, Schedule of Activities, prescribes that the thermal water extraction projects which exceed 25 Mega Watt, or geothermal steam capable of generating equivalent power for industrial and other purposes are required full EIA.
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the nature of the project, including the technology and processes to be used and their physical
impacts;
the content and amount of pollutants that will be released during implementation as well as
during operation;
source and amount of energy required for operation;
characteristics and duration of all the estimated direct or indirect, positive or negative impacts
on living things and the physical environment;
measures proposed to eliminate, minimize, or mitigate negative impacts;
a contingency plan in case of accidents; and,
procedures of internal monitoring and auditing during implementation and operation.
Figure 4.2.1 shows the outline of process and procedures of EIA in Ethiopia. Detailed EIA procedural
flow is shown in Appendix 4.2.
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Figure 4.2.1 Outline of Process and Procedures of EIA in Ethiopia
SUBMIT APPLICATION TO ACCESSMENT AGENCIES
ACCEPT
REJECT
PRE-SCREENING CONSULTATION
SCREENING
REVIEW SCREENING REPORT CONSULTATION
ACCEPT
DECISION
SCOPING
REVIEW SCOPING REPORT CONSULTATION
AMEND
AMEND
ACCEPT
DECISION
EIA
REVIEW EIS
AMEND
ACCEPT
DECISION
APPROVED
NOT APPROVED
CONDITION OF APPROVAL
IMPLEMENTATION AUDIT
RECORD OF DECISION
APPEAL
Source: Environmental Impact Assessment Procedural Guideline Series 1, 2003
PROPOSAL TO UNDERTAKE ACTIVITY/INVESTMENT
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(2) Environment related standards and Limit Values
For the preservation of the national environmental quality, the EPA of FDRE set national environmental
quality standards for air, water, noise, etc. The EPA also provided industrial pollution control standards
in order to manage negative impacts on the environment caused by the industrial and economical
projects or programs. But some of these standards remain still in draft form at present. In such cases,
International Standards are commonly relied upon. Geothermal energy development projects should
follow these standards at the implementation of projects. In case where sector specific standards are not
available, then general standards for industrial effluent and for gaseous emission are adopted from other
countries such as South Africa or international ones. Table 4.2.2 to Table 4.2.7 below summarize the
Ethiopian and the World Bank’s standards of Environmental, Health, and Safety Guidelines (EHS)
applied to geothermal energy development projects.
Table 4.2.2 Draft Standards for Industrial Emission and Effluent Limits (Ethiopian EPA)
Parameter Unit Draft Standard
Discharge of Wastewater
pH - 6 – 9 BOD5 at 20℃ mg/L 25 COD mg/L 150 Total Phosphorous P mg/L 5 Suspended solids mg/L 50 Mineral oil at the oil trap/interceptor mg/L 20
Emission of pollutant
Total particulates mg/Nm3 150 SO2 mg/Nm3 1,000 NO2 mg/Nm3 2,000
Source: Ethiopia EPA
Table 4.2.3 Draft Standards for Ambient Air Condition (Ethiopian EPA)
Parameter Average time Standard (μg/m3)
SO2 10 min 500 24 hr 125 1 yr 50
NO2 24 hr 200 1 yr 40
CO 15 min 100,000 30 min 60,000
1 yr 30,000
PM10 24 hr 150 1 yr 50
Source: Ethiopia EPA
Table 4.2.4 National Noise Standard at Noise Sensitive Areas
Area Category Limits in dB(A) Leq
Remark Day time Night time
Industrial 75 70 Day time: from 6 am to 9 pm Night time: from 9 pm to 6
am Commercial 65 55 Residential 55 45
(Note: Noise sensitive areas include domestic dwellings, hospitals, schools, places of worship, or areas of high amenity)
Source: Ethiopia EPA
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Table 4.2.5 EHS Guidelines for Emission Gas
Pollutants Units Value Particulate matter mg/Nm3 30 (a)
Dust mg/Nm3 50 SO2 mg/Nm3 400 NOx mg/Nm3 600 HCl mg/Nm3 10 (b)
Total organic carbon mg/Nm3 10 Dioxins-Furans mg TEQ/Nm3 0.1 (b)
Total metals mg/Nm3 0.5 Notes
(*) Emissions from the stack unless otherwise noted. Daily average values corrected to 273K, 101.3 kPa, 10 percent O2 and dry gas, unless otherwise noted. 10 mg/Nm3, if more than 40 percent of resulting heat release comes from hazardous waste. if more than 40 percent of resulting heat release comes from hazardous waste average values over the sample period of a minimum of 30 minutes and a maximum of 8 hours. (c) Total metals: Arsenic (As), Lead (Pb), Cobalt (Co), Chromium (Cr), Copper (Cu), Manganese (Mn), Nickel (Ni), Vanadium (Vn), and Antimony (Sb)
Source: EHS Guidelines
Table 4.2.6 EHS Guidelines for Effluent
Pollutants Units Value pH - 6 – 9
BOD mg/L 30 COD 125
Total Nitrogen 10 Total Phosphorous 2
Oil and Grease 10 Total suspended solids 50 Total coliform bacteria MPN/100ml
(b) 400 (a)
Notes Not applicable to centralized, municipal, waste water treatment systems which are included in guidelines for Water and Sanitation EHS MPN: Most Probable Number
Source: EHS Guidelines
Table 4.2.7 EHS Guidelines for Noise Management Receptor Day time Night time
07:00 – 22:00 22:00 – 07:00 Residential, institutional,
educational (a) 55 45
Industrial, commercial 70 70 (*) Guidelines values are for noise levels measured out of doors. Source: Guidelines for Community Noise, WHO, 1999 For Acceptable indoor noise level for residential, institutional, and educational settings, WHO, 1999
Source: EHS Guidelines
(3) Legislation related to the resettlement and land acquisition
Geothermal Power Generation Plant requires construction of the geothermal production well,
reinjection well (to return waste hot water to underground), pipeline, geothermal generation facilities
such as steam separator, vapor turbine, generator, cooling tower, generating facilities, transformer
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facilities for transmission into the electrical grid, etc. In order to accommodate those facilities,
adequate scales of the land are requires and those may associate with the land acquisition.
Constitution (1995) assure right of private property for citizen but not land ownership. The land is
recognized as public common property and its usufruct right can be processed, sold and transferred by
citizens. Also, farm land can be used by the citizen freely as long as the person possess the rural land use
right. “Federal Democratic Republic of Ethiopia Rural Land Administration and land Use Proclamation,
Proclamation No.456/2005” provides the rural land use right. The law also prescribes the governmental
responsibility that regional government have obligation to organize adequate legislative administration
under the central governmental policy. Hens, related to the farm land, regional governments work for
the grant and management of the rural land use right.
Principle of the land acquisition for the public purpose is provided in the constitution (1995) and the
detail procedure such as expropriation process and compensation standard are prescribed in “the
Expropriation of Landholding for Public Purposes and Payment of Compensation Proclamation,
Proclamation No. 455/2005”. “Payment of Compensation for Property Situated on Landholdings
Expropriated for Public Purposes, Council Ministers Regulation No. 135/2007” also provides further
detail standard such as compensation standard for the each expropriating asset.
According to the regulation (2007), land expropriation is implemented by local government, Woreda or
Urban administration exclusively for the public purpose and it should be adequately compensated to
PAPs. As the principle of the compensation, transferring cost for the asset on the land is compensated
for the residential land and 10 times of the annual income which is averaged the incomes in last 5 years
is compensated for the farm land. The one of the preferable way, the regulation prescribes that
provision of the alternative land which enable to be utilized equal to the previous land.
(4) Gaps between Ethiopian Legislations and JICA Guidelines (2010) Policies on Environmental Assessment
From the above discussions, it can be concluded that the JICA Environmental guidelines and the
legislation in the country do not have major contradiction, except perhaps certain procedural
adjustments during project implementation such as public consultation and public disclosure. Appendix
4.3 shows the gaps between current relevant regulations in Ethiopia and JICA Guidelines for
Environmental and Social Considerations (April, 2010) as well as Safeguard Polices in the World Bank.
4.2.2 Institutional Framework of Environmental Management in FDRE
The Federal Democratic Republic of Ethiopia (FDRE) consists of 2 chartered cities, namely Addis
Ababa and Dire Dawa, and 9 regional states. Proclamations 33/1992, 41/1993 and 4/1995 define the
duties and responsibilities of the regional states which include planning, directing and developing social
and economic development programs as well as protection of natural resources. The most important step
in setting up the legal framework for the environmental in Ethiopia has been the establishment of the
Environmental Protection Authority (EPA). The EPA, which has been established under the
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proclamation no. 295/2002, is now a ministerial level environmental regulatory and monitoring body.
The objectives of the EPA are to formulate policies, strategies, laws and standards, which promote social
and economic development in a manner that enhance the welfare of humans and the safety of the
environment sustainably, and to spearhead in ensuring the effectiveness of the process of their
implantation. It is, therefore, the responsibility of the EPA in the EIA process to:
ensure that the proponent complies with requirements of the EIA process;
maintain co-operation and consultation between the different sectoral agencies throughout the EIA
process;
maintain a close relationship with the proponent and to provide guidance on the process; and
evaluate and take decisions on the documents that arise from the EIA process.
On the other hand, the regional environmental agencies are responsible for:
Adopt and interpret federal level EIA policies and systems or requirements in line with their
respective local realities;
Establish a system for EIA of public and private projects, as well as social and economic
development policies, strategies, laws, or programs of regional level functions;
Inform EPA about malpractices that affect the sustainability of the environment regarding EIA and
cooperate with EPA in compliant investigations;
Administer, oversee, and pass major decisions regarding impact assessment of:
projects subject to licensing by regional agency;
projects subject to execution by a regional agency;
projects likely to have regional impacts.
Similar to other developmental projects, the proposed geothermal power plants are subject to several
policies and programs aimed at development and environmental protection. The EPA, in cooperation
with other related organizations such as Ministry of Mines and Ethiopian Electric Power Corporation
(EEPCo), regulates the environmental management system for all projects across the country.
Following shows the major institutions or organizations which concern the development of geothermal
energy.
Regional Government: All prospective sites are located in three regional governments, namely,
Afar, Oromia and Somali regional governments. The Region has Zones and Woredas. Within each
Woreda there is many Kebele. Each administrative unit has its own local government elected by the
people. Feature of these three regional governments are summarized in Table 4.3.1.
The Geological Survey of Ethiopia (GSE): The Geological survey of Ethiopia (GSE), under the
Ministry of Mines, has the organizational mandate and legislative instruments that empower it to
execute geothermal projects to the end of the exploration stage. These include:
Surface exploration
Exploratory drilling
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Well testing and feasibility studies
Ministry of Water and Energy (MoWE): The Ministry of Water and Energy is the regulatory
body for the energy sector. Based on the delegation from EPA, the whole draft EIA document shall
be submitted to the Ministry for comments and recommendations. The Ministry will also certify the
implementation of the project and monitor the performance of the development project.
Ethiopian Electric Power Corporation (EEPCo): The Ethiopian Electric Power Corporation
(EEPCo) is a national electricity utility established as a public enterprise by Council of Ministers
regulation No. 18/1997. According to the regulation, EEPCo is mandated to engage in the business
of power generation, transmission, distribution and selling of electric energy and to carry out any
other activities that would enable it to achieve its stated mission.
Pastoralist and Agricultural and Rural Development Office of Regional State: The Ministry of
Agriculture and the EPA have delegated their authority to the regional bureau of Pastoralist and
Agriculture and Rural Development.
Corporate Planning Department of EEPCo: Corporate Planning of EEPCo comprises
environmentalists and sociologists to address environmental and social issues that may arise due to
its operation. The project office shall be instituted in this organization with defined roles,
responsibilities, and authority to implement the socio-environmentally critical actions such as
implementation of EIA, EMP and so on to be undertaken.
4.3 Baseline Survey
4.3.1 Methodology of Baseline survey
Standard methodologies to collect data and information at the prospective geothermal energy
development sites were applied to carry out the study that included primary and secondary data
reviewing. Additionally, the ESIA study team collected data and information at the prospective
geothermal energy development sites using questionnaires, and visiting the governmental and the local
organizations which are responsible for environment, social, economic, cultural, and so on located in
Oromia, Afar and Somali regions. For the implementation of the study above, following eight kinds of
questionnaires were used:
Questionnaire for Kebele level cultural and ecological related questionnaire
Kebele level education related questionnaire
Kebele level health related questionnaire
Kebele level water resource related questionnaire
Kebele level water and energy resource related questionnaire
Questionnaire for household
Kebele level Economic related Questionnaire
Questionnaire for Focus Group Discussion (FGD)- Community CONSULTATIONS
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The ESIA study team visited the following 7 Woreda sector offices for the collection of baseline data at
each site.
Agriculture /pastoralist office,
Economic & finance office,
Education office,
Health office,
Culture &tourism office,
Land use and environment office, and
Water & energy office
As for surveys at #4 Damali and #05 Teo in Table 4.1.1, the surveys were conducted only through
data/information collection and literature review, due to the difficulty of accessibility to these two sites.
4.3.2 Outline of the Baseline data
(1) Profile of the Study Area
Data and information collected through the ESIA study have been summarized in terms of the
environmental and the social conditions such as i) natural and geological conditions, ii) socio economic
conditions, and iii) accessibility/road, together with notable potential environmental and social impacts
when geothermal energy development projects are implemented at 15 prospective sites respectively.
Summary table is shown in Appendix 4.4. Major data and information collected are shown below.
The 16 prospective geothermal energy development sites are located either in Afar Depression or
Main Rift Valley. Among the 15 prospective sites, 8 geothermal energy development sites are located
in Afar Depression and the rest 7 sites are located in the Main Ethiopian Rift Valley.
The three study Regional States, namely the regions of Afar, Oromo, and Somali, more or less share
similar features. They border with each other. Oromia borders Afar, Amhara and Benshangul/Gumuz
Regions in the north; in the south Oromia borders Kenya; in the south and in the east Oromia borders
Somali. In the West, Oromia borders Sudan. On the other hand, Afar borders Eritrea in the north-east,
Tigray in the northwest, and Amhara and Oromia in south and south west respectively. Somali
Regional state borders Afar Region and Djibouti in the north, Kenya in the south, Oromia Region in
the west, and Somalia in the east and in the South.
While the bigger size of Afar Region lies within the Ethiopian Rift Valley, only some parts of Oromia
and Somali that lie in the Rift Valley. With respect to population, Oromia Region has the largest figure,
roughly 35, 500,000, followed by Somali, roughly 5,850,000 and Afar, roughly 1,830,000,
respectively. Profiles of the three regions are summarized in the table below (Table 4.3.1).
Table 4.3.1 Profile of Three Regions
Region Afar Oromia Somali
Location Mainly at eastern part of Ethiopia Mainly at the west, south, and Mainly at the eastern and
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Region Afar Oromia Somali
eastern part of Ethiopia southeastern of Ethiopia Topography Dominantly low land located
within Great Rift Valley, dominantly, sandy and rocky.
Varied topography, from low land to high lands varied relief features: rugged mountain ranges, plateaus, gorges and deep incised river valleys, and rolling plain.
Mainly low land, about 80% of the topography is flat and sandy.
Climatic conditions
From 25℃during the rainy season (September-March) to 48℃ during the dry season.
Varied with amiable climatic condition, dry, tropical rainy and temperate rainy climate.
Bigger proportion (85%) is dry and hot, characterized by 20℃ to 40℃.
Area 96,707 km2 284,538 km2 279,252 km2 Population 1,828,504 (up dated for 2014) 35,522,174 (up dated for 2014) 5,849,605 (up dated for 2014) Religious More than 90% Muslim More than 90% are proportionally
Muslim and Christians More than 90% Muslim
Language Dominantly Afar but Amharic is widely spoken
Dominantly Oromo language but Amharic is widely spoken
Dominantly Somali but Oromo and Amhara language are widely spoken.
Administration 5 administrative zones and about 30 woredas
12 zones administrative and about 180 woredas
9 administrative zones and more than 45 woredas
Capital city Semera Addis Ababa, defacto Adama (Nazareth)
Jigjiga
Livelihood Mainly cattle rearing/pastoralists Mainly farming Mainly cattle rearing/pastoralists Agri products Maize, beans, sorghum, papaya,
banana, and orange Maize, teff, wheat, barley, peas, bean, oil seed, coffee
Mainly sorghum and maize, and some wheat harvested
Animals 22% of camel, 4% of goats, 2% of sheep, and 1% of cattle
45.4% of cattle, 40% of goats, 38% of sheep, 12% of asses, 31% of camels
2% of cattle, 3% of sheep, 6% of goats, 4% of asses and 37% of camels
National Attractions
Afar Depression-Ertale, Awash and Yangudi Rassal National Parks, Human fossil sites such as Hadar and Ramis
National Parks Bale mountains, the Rift Valley lakes, caves like Sof-Omar and a number of hot springs are located
As part of the great Rift Valley hot springs are located in some parts
Minerals Major minerals include: salt, potash, sulfur, manganese, bentonite, aluminium, marble, gypsum
Gold, soda ash, platinum, limestone, gypsum, clay soil, tantalum, and ceramic
Natural gum, salt, and gas oil
Data source: CSA and other relevant documents
(2) Natural, Historical and Cultural Heritages
In general, there are no natural and historical points found near or around all of the proposed sites.
However, the views the community to the hot springs (in Teo/Kone, Meteka, Boku, and Arabi), the
claims of Orthodox Church (in Boku), and the location of the Orthodox Church (in Meteka) needs
special consideration. The detail is shown in Table 4.3.2.
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Table 4.3.2 Natural, Historical and Cultural Heritages
Source: ESIA Study Report
(3) Ecological Protected Area
All legally protected areas such as national park, wildlife reserve and controlled hunting areas are
avoided from the prioritized project sites in the study at the Master Plan establishment stage. The project
contains 15 project sites located in the 3 regions i.e.; Afar, Somali and Oromia regions. The
environmentally important area in Ethiopia is protected as National Parks, Wildlife Reserves and
Controlled Hunting Areas and the areas fallen into the project related 3 regions are shown in the below
table(Table 4.3.3). With the progress of the project stage, further confirmation should be conducted to
minimized impact to those areas.
Table 4.3.3 Distribution of sensitive environmental features surrounding the project
Source: ESIA Study Report
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(4) Possible Impacts by Transmission Line
The Project includes the construction of high voltage Power transmission lines. High voltage Power
transmission lines may have an impact on the visual capacities of birds and may result in collisions
depending on sites of installation. Because of the exact routes where the transmission lines are going
to be developed are not yet determined, it is not possible to envisage the degree of the impacts caused
by the installation of the transmission lines on migratory birds. Although the prospective geothermal
development sites in this study are not included in National Parks or Conservation Areas of Ethiopia,
there exist a few National Parks near some prospective sites. The ESIA study revealed that the two
National Parks vicinity to some prospective sites located on important migration flyways. One is
Yangudi Rassa National Park which is in the center of the Afar Region (in northern section of the Rift
Valley) between the towns of Gewanae and Mille, and 500km from Addis Ababa. Yangudi Mountain
lies on its south-eastern boundary, and is surrounded by the Rassa plains. Many migratory species
have been found in this area including Falco naumanni and Circus macrourus, both of which are
recorded regularly on migration during winter season. Another National Park which locates on a
migratory flyway is Abijata-Shalla Park in Oromia Region which was established combining Lakes
Abijata and Shalla. It has several hot springs around the shore, and nine islands of which at least four
are important breeding sites for birds. This Park locates on a major flyway for both Palearctic and
African migrants, particularly raptors, flamingos and other water birds. Detailed migratory flyways
should be investigated in the EIA study for the determination of the routes of high voltage
transmission lines in order to avoid or minimize the impacts on migratory birds.
4.4 Strategic Environmental Assessment (SEA)
Strategic environmental assessment (SEA) is a systematic decision support process, aiming to ensure
that environmental and possibly other sustainability aspects are considered effectively in policy, plan
and program making. Therefore, an SEA is conducted before a corresponding EIA is undertaken. This
means that SEA focuses mainly policy level issues before implementing certain projects or programs.
Although implementation of SEA for development projects is not compulsory at present in Ethiopia,
considering the definition and the concept of SEA mentioned above, SEA for geothermal energy
projects should be discussed the following point of views.
Ethiopian energy policy on geothermal development,
Project alternatives including “do-nothing” option
Project perspective from guidelines of financial institutions,
Alignment of JICA guidelines with national policies
4.4.1 Ethiopian energy policy on geothermal development
(1) Conservation Strategy of Ethiopia (CSE)
Since the early 1990s, the Federal Government has undertaken a number of initiatives to develop
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regional, national and sector strategies for environmental conservation and protection based on the
Conservation Strategy of Ethiopia (CSE) approved by the Council of Ministers. The CSE provided a
strategic framework for integrating environmental planning into new and existing policies, programs
and projects. The CSE also provides a comprehensive and rational approach to environmental
management in a very broad sense, covering national and regional strategies, sectoral and cross sectoral
strategy, action plans and programs, as well as providing the basis for development of appropriate
institutional and legal frame works for implementation.
(2) Environmental Policy of Ethiopia (EPE)
The Environmental Policy (EPE) of the FDRE was approved by the Council of Ministers in April
1997based on the CSE. It is fully integrated and compatible with the overall long term economic
development strategy of the country, known as Agricultural Development Led Industrialization (ADLI),
and other key national policies. EPE’s overall policy goals may be summarized in terms of the
improvement and enhancement of the health and quality of life of all Ethiopians and the promotion of
sustainable social and economic development through the adoption of sound environmental
management principles. Specific policy objectives and key guiding principles are set out clearly in the
EPE, and expand on various aspects of the overall goal. The policy contains sector and cross-sector
policies and also has provisions required for the appropriate implementation of the policy itself.
(3) National Energy Development Policy
The National Energy Policy of 1994 has the objective of facilitating the development of energy
resources for economical supply of energy to consumers in an appropriate form and in the required
quantity and quality. The strategies consist of the accelerated development of indigenous energy
resources and the promotion of private investment in the production and supply of energy.
According to the National Energy Development Policy, the main priorities of current energy policy in
Ethiopia are:
Equitable development of the energy sector together with other social and economic developments.
Development of indigenous resources with minimum environmental impact and equitably
distribution of electricity in all the regions.
4.4.2 Energy Resource Alternatives
The Ethiopian Government has embarked upon various plans and programs to explore and develop
different energy resources (i.e., hydropower, geothermal, wind and solar) to achieve the major goals of
accelerating economic growth and reducing poverty. Development of geothermal energy exerts both
positive and negative impacts on the natural and the social environment. There is no combustion process
with geothermal energy plant, geothermal energy is generally accepted as being an environmentally
kind and gentle energy source comparing to fossil fuel energy source. Considering the characteristic of
geothermal energy source, geothermal energy source also has several advantages even compared to
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other renewable energy sources. Table 4.4.1 and Table 4.4.2 below show the characteristics and the
advantages of geothermal energy compared to other energy sources.
Table 4.4.1 Environmental Characteristics of Geothermal Energy
Geothermal energy Other renewable energy
Availability/reliability Most reliably available Not rely on uncontrollable outside forces
Such as solar or wind, are only available when the weather cooperates.
Natural condition Less constrained by natural topography for selection of site
Required to meet specific natural condition (effective wind or solar farm)
Land claim Not require as much land to produce equivalent power as do other clean energies.
Roughly 10 times of amount of land is needed for a solar farm to produce the same amount of energy
Cleanness/Cost effectiveness Cleaner, more efficient, and more cost-effective than burning fossil fuels
Burning fossil fuels generate dust, NOx, SOx and other noxious substances
Emission of CO2 and others Geothermal plant releases a less amount of CO2 produced by fossil fuel plant
Fossil fuel plants produce more amount of CO2
Source: JICA Study Team
Table 4.4.2 Advantages of Geothermal Energy Compared to other Renewable Energy Sources
Characteristics Geothermal Wind Solar Biomass Hydro Base lord capacity ◎ × × ◎ ◎ Unlimited potential ◎ ◎ ◎ × × No fuel costs ◎ ◎ ◎ × ◎ Negligible CO2 emission ◎ ◎ ◎ × Low impact landscape ◎ × × ◎ × Competitive costs ◎ ◎ × ◎ ◎ Capacity factor (%) 89-97 26-40 22.5-32.2 80 - Exploration risk ? ◎ ◎ ◎ ◎
Source: Ultra-deep-geothermal/energy,A Guide to Geothermal Energy and Environment, Geothermal Energy
Association, USA 2007)
Above tables show that geothermal energy is a renewable and environmentally friendly energy
generation option, compared to other energy sources particularly compared with fossil fuel.
Besides the advantages of geothermal energy source above, there are several positive impacts on the
social environment. Main positive impacts of geothermal energy development are: stimulation of
economic growth of the country, improvement of the living standard of the population, benefits to the
local people (temporary employment opportunity) and local economy development. The proposed
geothermal energy development would encourage investors to invest in the region, ultimately creating
more job opportunities. The proposed project will also allow the reduction of carbon dioxide emissions
from electricity generation using renewable geothermal energy instead of other fossil fuel burning
power generation. This suggests that the application of Clean Development Mechanism (CDM) to the
projects.
4.4.3 Project Alternatives
One of the main objectives of SEA is to analyze the alternatives of the proposed project including
“do-nothing” option. To overcome the growing demand, planning for energy diversification is very
important. Therefore, the formulation of geothermal energy development by this study is an important
step to diversify electricity generation which will enable to backup the other energy sources. The impact Nippon Koei Co., Ltd. JMC Geothermal Engineering Co., Ltd Sumiko Resources Exploration & Development Co., Ltd.
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caused the implementation of the project on the environment and social is localized and can be
minimized by applying proper mitigation and management measures.
Considering the features of geothermal energy development, possible alternatives at SEA stage could
be:
a "do-nothing" option of the project to consider the environmental conditions in the absence of the
project (without project),
drilling the wells at different depths, to exploit different reservoirs (with project)
Table 4.4.3 below summarizes the advantage and the disadvantage two alternatives above.
Table 4.4.3 Comparison of Alternative
Alternatives Advantage Disadvantage
1
Wit
hout
pro
ject
Do-nothing No additional environmental impacts related to the project
No social and socio-economic benefits to the country. Worsening of the deforestation problem. No promotion educational, commercial and industrial development.
2
Wit
h pr
ojec
t
Drilling wells at different depth
Drilling and exploiting wells only from the deep reservoir
Less or no subsidence risks More expensive, longer solution
Drilling and exploiting wells only from the shallow reservoir
Cheaper and faster solution Subsidence risks
Drilling wells in different location
Drilling in the sites prioritized in this study (Tendaho, Ayrobera)
Higher environmental appropriateness (See Appendix 4.4)
Dispossession of grazing land, water use competition, etc. (See Appendix 4.4)
Drilling in the sites other than above sites
No residential areas (See Appendix 4.4)
Bad accessibility, etc. (See Appendix 4.4)
Source: Tendaho Geothermal Development F/S Report, 2013, Italy
The “no project option” implies that the power plant will not be established at the project site and the site
would continue to remain as it were. No socio-economic benefits would accrue either to the nearby
communities or to the country at large. Choosing the “no project option” therefore will mean loss of
benefit to the nation, what is more, no new employment opportunities would be created.
Selecting the depth / location of wells is very critical for the feasibility of a project. Therefore, proper
and comprehensive analysis of location and site selection shall be carried out utilizing different factors
and criteria.
4.5 Implementation of IEE
An Initial Environmental Examination (IEE) is carried out based on the baseline data and information,
namely readily available information including existing data and simple field surveys.
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4.5.1 Project Categorization
(1) General
According to the JICA Environmental Guidelines (April 2010), projects are classified into four
categories depending on the extent of environmental and social impacts, taking into account an outline
of project, scale, site condition, etc. Table below shows the comparison of projects categorization
defined by JICA and Ethiopian national EPA Guideline.
Table 4.5.1 Environmental Categorization of Projects
Project type JICA Guidelines Ethiopia EPA
Guideline EIA requirement
Likely to have significant adverse impacts on the environment and society. Projects with complicated or unprecedented impacts that are difficult to assess, or projects with a wide range of impacts or irreversible impacts
Category A Schedule-1 Full EIA
Have potential adverse impacts on the environment and society are less adverse than those of Category A projects. Generally, they are site-specific; few if any are irreversible; and in most cases, normal mitigation measures can be designed more read
Category B Schedle-2 Not likely to warrant a
full EIA study
Have are likely to have minimal or little adverse impact on the environment and society. Category C Schedule-3
Environmental review will not proceed after
categorization Projects which satisfy the following JICA’s requirements: projects of JICA’s funding to a financial intermediary or executing agency; the selection and appraisal of the sub-projects is substantially undertaken by such an institution only after JICA’s approval of the funding, so that the sub-projects cannot be specified prior to JICA’s approval of funding (or project appraisal); and those sub-projects are expected to have a potential impact on the environment.
Category FI - Environmental review
will proceed after categorization
Source: JICA Study Team
(2) Classification of geothermal energy development project
Appendix I (Schedule of Activities) of the Environmental Impact Assessment Guideline Document
(May 2000) classifies projects by their type of activities as follows:
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Based on the project classification above, geothermal energy development projects which have
capacities more than 25 mega watt may be required the implementation of full scale EIA.
4.5.2 Scoping for Initial Environmental Examination
Geothermal energy is generally more environmentally sound compare to other energy sources such as
fossil fuel burnings, there are certain negative impacts that must be considered and managed when
geothermal energy is to be developed. Following table summarizes the considerable negative impacts
when geothermal energy is developed.
In order to assess likely significant environmental and social impacts, the conceivable adverse
environmental and social impacts by the Project were initially indentified based on the project
description and overall environmental and social conditions in the surrounding area. The impacts of
pollution, natural environment, and social environment were classified from A to D as shown in Table
4.5.2. Most of potentially important impacts of geothermal power plant development are associated
with groundwater use and contamination, and with related concerns about land subsidence and
induced seismicity as a result of water injection and production into and out of a fractured reservoir
formation. Some considerations should also be taken for issues of air pollution, noise, safety, and land
use. Overall environmental Scoping Checklist is shown in Appendix 4.4).
APPENDIX 1: SCHEDULE OF ACTIVITIES (In order of level)
Schedule 1: Project which may have adverse and significant environmental impacts, and may, therefore, require full EIA.
C. Production Sector
11. Minerals extraction and processing (Large scale Mining Operation, Which the annual run of mine ore exceed:)
f. Thermal Water (25 Mega Watt, or geothermal steam capable of generating
equivalent power for industrial and other purposes)
Source: Environmental Impact Assessment Guideline Document, May 2000
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Table 4.5.2 Environmental Scoping Checklist for the Project for Formulating Master Plan on Development of Geothermal Energy in Ethiopia project
No Likely Impacts Reason and Description Rating
Social Environment 1 Involuntary
resettlement Planning phase: Land for geothermal plant is required. There are residents in the prospect site area and the impact should be minimized to avoid resettlements and land area. The approximate number of land owner for the prospect sites are 50 persons in total. Detail study should be conducted.
C-
2 Living and Livelihood Construction phase: Surface disturbance of wilderness has high impact as active sites tend to be in rare landscape types of very high scenic and touristic (economic) value including ‘colorful striking landscapes, hot springs, lavas and glaciers. Disturbance includes roads, power lines, factories, heavy lorries and drilling equipment.
B-
Construction phase & Operation phase: Job opportunities for the surrounding area for project sites are increased.
B+
3 Land use and utilization of local resources
Planning phase & Construction phase: The project areas are used mainly as farmland and grazing land, with dispersedly located houses, while few of them (Erabti, Dallol, Derail and Teo) are nearly uninhabited. Meteka, Bobessa, Finkilo, and Dofan sites are populated; particularly Meteka is densely settled by town residents. The rest sites Arabi, Tone, Allelobeda, Boset, Gedemsa and Boku are dominantly used either for cultivation or grazing. One special scenario is the case of Bobessa and Finkilo (Alluto 2 and 3). Here, the site is in adjacent to geothermal power facility which has been under construction by Ethiopian Energy and Power Corporation (EEPC) for the last few years.
B-
Operation phase: The effective land use is expected in the area. B+ 4 The poor, indigenous
and ethnic people No particular indigenous people and ethnic people are identified in the area at the moment. D
5 Local conflicts of interests
No particular impact is envisaged at the moment. D
6 Water usage or water rights and rights of common
Planning phase, Construction phase and Operation phase: The project may be associated with the well drillings such as testing, geothermal production and reinjection wells. Also, construction and operation of power generation plant may require freshwater. The impact should be minimized based on the study at the detail design stage.
C-
7 Hazards(Risks) (infectious disease such as HIV/AIDS)
No particular impact is envisaged at the moment. D
8 Working Conditions No particular impact is envisaged at the moment. D 9 Disaster No particular impact is envisaged at the moment. D Natural Environment 10 Topography and
geographic features Construction phase: Surface disturbance of wilderness has high impact as active sites tend to be in rare landscape types of very high scenic and toursitic (economic) value including ‘colourful striking landscapes, hot springs, lavas and glaciers. Disturbance includes roads, power lines, factories, heavy lorries and drilling equipment.
B-
11 Land subsidence Operation phase: Subsidence, or the slow, downward sinking of land, may be linked to geothermal reservoir pressure decline. Injection technology, employed at all geothermal sites in the United States, is an effective mitigating technique.
B-
12 Climate Operation phase: Local weather changes caused by emission of steam affecting clouds. B- 13 Soil erosion Construction phase: Landslides can occur due to temperature and water level in rocks,
especially in tectonically active areas. B-
14 Wetlands, rivers and lakes
Planning phase, Construction phase, Operation phase: Some project sites such as Meteka and Kone are located closely to wetland. Some impact may be associated with the project.
B-
15 Fauna and flora and biodiversity
Planning phase and Construction phase: The protected areas are basically avoided for the site selection. For detail survey should be conducted at the implementation of full EIA study (ESIA). Before geothermal construction can begin, an environmental review may be required to categorize potential effects upon plants and animals. Power plants are designed to minimize the potential effect upon wildlife and vegetation, and they are constructed in accordance with a host of state and federal regulations that protect areas set for development.
B-
16 Landscape Construction phase: Surface disturbance of wilderness has high impact as active sites tend to be in rare landscape types of very high scenic and touristic (economic) value including ‘colorful striking landscapes, hot springs, lavas and glaciers. Disturbance includes roads, power lines, factories, heavy lorries and drilling equipment.
B-
17 Ground water Planning phase, Construction phase and Operation phase: The project may be associated with the well drillings such as testing, geothermal production and reinjection wells. Also, construction and operation of power generation plant may require freshwater. The impact should be minimized based on the study at the detail design stage.
C-
Pollution 18 Air pollution Construction phase: Due to construction work in the city area, air quality is likely affected
due to congestion of traffic and other construction machinery. Geothermal power plants release very few air emissions because they do not burn fuel like
B-
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No Likely Impacts Reason and Description Rating
fossil fuel plants. Geothermal plants emit only trace amounts of nitrogen oxides, almost no sulfur dioxide or particulate matter, and small amounts of carbon dioxide. The primary pollutant some geothermal plants must sometimes abate is hydrogen sulfide, which is naturally present in many subsurface geothermal reservoirs. With the use of advanced abatement equipment, however, emissions of hydrogen sulfide are regularly maintained below Ethiopian standards. Emissions of H2S –distinguished by its “rotten egg” odor and detectable at 30 parts per billion – are strictly regulated to avoid adverse impacts on plant and human life.
19 Water contamination (Water use & Water contamination)
Planning Phase, Construction Phase and Operation Phase: Liquid streams from well drilling, stimulation, and production may contain a variety of dissolved minerals, especially for high-temperature reservoirs (>230°C) which may not be the case at most of the geothermal prospect areas in Ethiopia. Some of these dissolved minerals (e.g., boron and arsenic) could poison surface or ground waters and also harm local vegetation only in some locations. Liquid streams may enter the environment through surface runoff or through breaks in the well casing. Surface runoff can be controlled by directing fluids to impermeable holding ponds and by injection of all waste streams deep underground. It is important to monitor wells during drilling and subsequent operation, so that any leakage through casing failures can be rapidly detected and managed. Toxic waste water may enter clean aquifers due to lowering of the water table.
B-
20 Wastes Planning Phase, Construction phase and Operation phase: At the detail survey and construction, sludge from the drilling work may be generated. Also, construction waste and general waste at the operation may be generated even those amount are not large. Adequate treatment should be conducted following the standard.
C-
21 Noise and vibration Planning Phase (Well drilling and testing phase): Generally noise generation in this phase does not exceed the Ethiopian noise regulations. Much like the construction phase of development mentioned below, well-drilling and testing are temporary, and the noise pollution they produce is not permanent. It is estimated that well drilling operations would not exceed 54 dBA. However, unlike the construction phase of development, well-drilling operations typically take place 24 hours per day, seven days a week. This temporary noise pollution can last anywhere from 45 to 90 days per well. Construction phase (Noisiest phase): Noise may be generated from construction of the well pads, transmission towers, and power plant. The noisiest phase of geothermal development, but the past experiences show generally remains below 65 dBA. Noise pollution associated with the construction phase of geothermal development is a temporary impact that ends when construction ends. Well pad construction can take from a few weeks or months to a few years, depending upon the depth of the well. In addition, construction noise pollution is generally only an issue during the daytime hours and is not a concern at night. Operation phase: Noise from normal power plant operation generally comes from the three components of the power plant: the cooling tower, the transformer, and the turbine-generator building. It is estimated, noise from normal power plant operation at the site boundary would occupy a range of 15 to 28 dBA—below the level of a whisper Several noise muffling techniques and equipment are available for geothermal facilities. During drilling, temporary noise shields can be constructed around portions of drilling rigs. Noise controls can also be used on standard construction equipment, impact tools can be shielded, and exhaust muffling equipment can be installed where appropriate.
B-
22 Odor Planning phase, Construction phase and Operation phase: Even temporary, emission of hydrogen sulfide (H2S) may associate with the Geothermal production test at detail survey and construction. At the operation, also hydrogen sulfide (H2S) may be discharged. The impact should be minimized based on the study at the detail design stage.
C-
23 Accidents Construction phase and Operation phase: There was an example that violent explosions caused by buildup of a ‘steam pillow’ in empty hot underground reservoirs, which have previously killed people working in geothermal plants. While earthquake activity, or seismicity, is a natural phenomenon, geothermal production and injection operations have at times resulted in low-magnitude events known as ―micro earthquakes.‖ These events typically cannot be detected by humans, and are often monitored voluntarily by geothermal companies.
B-
Source: JICA Study Team
<Rating> A-: Serious impact is expected, if any measure is not implemented to the impact. B-: Some impact is expected, if any measure is not implemented to the impact. C-: Extent of impact is unknown (Examination is needed. Impact may become clear as study progresses.) D : No impact is expected. A+: Remarkable effect is expected due to the project implementation itself and environmental improvement
caused by the project. B+: Some effect is expected due to the project implementation itself and environmental improvement caused by
the project.
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4.5.3 Socio-environmental Interactions
In order to grasp the livelihood conditions in and around the prospective sites, questionnaire surveys for
energy and water sector offices at woreda levels were conducted. In this questionnaire surveys,
interviewee were professionals, experts and guidelines about the proposed geothermal projects and
related issues.
With respect to energy, in few households kerosene lamps and solar cells are becoming to be used
particularly in health posts and schools. However, the survey revealed that the main source of energy
both for cooking and light was fuel wood, coal and dung. The impact of wide use of wood and coal
would be not significant as the number of rural community is few and scattered, compared to the
available resource and its regenerative capacity. In addition to this, energy consumption per capita of
the community is very low. Social impacts such as unnecessary time and labor wastage should also be
addressed.
With regard to water source and supply, in most of the surveyed sites except Tendaho-3 (Alallobeda),
Arabi, Dofan, Meteka, and Kone, there is critical shortage of sufficient and uninterrupted water supply.
But in all other sites, access to potable (treated) water is still a priority. Water resource competition
from currently growing (expanding) sugar industries is pessimistically perceived by the community. In
addition to this, some individual investors use water from hot springs/when available for irrigation. So
there seemed water resource competition and fast land use change in some of the surveyed areas.
Respondents were asked about the negative impact of the project on water in terms of pollution, water
supply/ system; the possible competition of the project for the existing water resources; and options to
reduce or avoid the impacts. The finding revealed that the community believed the project would bring
about little negative impact. However in terms of the serious shortage of water all community in all
sites required the supply of water at least in their respective kebeles. Thus there is a strong need of
residents to implement community projects to access potable water source (characterized by
community participation in collaboration with other development organizations), parallel to the main
geothermal project.
Table 4.5.3 below summarizes the conditions of the livelihood in fifteen (15) prospective sites.
Table 4.5.3 Livelihood at the prospective sites
No. Site Livelihood
1 Dallol Wage and revenue earned from salt mining and transporting the commodity is the back bone of the livelihood of the community of Amed-ale. And yet since what is earned doesn’t cover households’ living expense, large proportions of them are under food relief program.
2 Tendaho-3 (Allalobeda)
The community is totally dependent on subsistence livestock. Thus food security in the woreda is seriously threatened. Thus since there is no farming practiced across the kebele, the community is under food relief assistance throughout the year.
3 Boina Bahri kebele is entirely dependent on subsistence livestock breeding and therefore agriculture is not practiced. As food security is seriously threatened, the community relies on food support distributed by the Government.
4 Damali Located in the Afar region at the central part Afar depression, administrated by Asayta Woreda. The area is in arid and dry land which has also very low and erratic rain fall pattern with below 300 mm precipitation. Located at low altitude, which is in between 250 500 meter above sea level.
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No. Site Livelihood
5 Teo
Located in the Afar region at the central part Afar depression, administrated by Mile Woreda. The area is in arid and dry land which has also very low and erratic rain fall pattern. The annual rain fall ranges between 300 – 500 mm precipitation. Located at low altitude, which is in between 250 - 500 meter above sea level.
6 Danab
Located in the Afar region at the central part Afar depression, administrated by Dubti Woreda. The area is in arid and dry land which has also very low and erratic rain fall pattern. The annual rain fall ranges between 300 – 500 mm precipitation. Located on the next elevated mountain plateau which have relatively high altitudes ranging 500 – 800 meter above sea level.
7 Meteka
Unlike other kebeles, Meteka is semi-urban small town. Thus, although agriculture is practiced in most other kebeles, the community of Meteka is either employed in different sectors or engaged in small businesses. As per the information obtained from the woreda office, the revenue that most residents generate from their business/employment hardly covers their costs of living. Due to this, some of the households are regular receivers of food assistance.
8 Arabi
The main agricultural activities (both commercial and subsistence) of the kebele are livestock keeping and crop production. In the areas surrounding the project site, the major cash crops produced are maize, sorghum, tomato, onion and fruits. The assessment reveals absence of big farms; what is more, neither animal husbandry, nor livestock keeping is dominant. Although, people living in the small town of Arabi engaged in the production of different kinds of fruits, the kebele is characterized by food insecurity mainly due to poor weather conditions, lack of water and infertility of the land. Relief food has been granted by the Ethiopian Government for the victims throughout the year. As reported, food prices increase as the result of more demand to food items. This poses a significant challenge for those pastoralists who never engaged in crop production and fully relied in purchasing food items
9 Dofan The communities of Dofan live on livestock breeding, though insignificant numbers of them are wage earners in big government and private farms. As many of Afar kebeles, the pastoralists of Dofan are not food secured thus receive food assistant regularly.
10 Kone
The livelihood of the community is based on subsistent farming and livestock keeping. In the areas surrounding the project site, the community is self sufficient in food. Using the available inconsistent rain some of the kebele dwellers produce cash crops including maize, tomato, onion and fruits.
11 Nazareth As far as food insecurity is concerned Boku kebele is relatively safe. Although part of the community is still far below the poverty line, the kebele is categorized under food secured kebeles and doesn’t receive food assistance from the government.
12 Gedemsa
The principal economy of the kebele is derived from agriculture products. Despite the inconsistent rain, absence of water and lack of irrigation practice, the kebele is one of the few areas known for food sufficiency. A better strategy such as supply of agricultural inputs, and access to water can increase productivity and could sustain the present status of food security.
14 Aluto-2
(Altu-Finkilo) Agriculture is the dominant means of livelihood in the two sites. While maize, wheat, and teff are the major agriculture products, to some extent fruits and vegetables such as onions and tomato are grown by few farmers. Productivity is highly limited because of lack of access to irrigation system and shortage of rain which is the only source for growing crops. As the result, the community is suffered from food insecurity. According to the woreda administration office, out of 43 kebeles in the woreda 23 rural kebeles (including Finkilo and Bobessa) are dependent on the food relief program sponsored by the Government of Ethiopia.
15 Aluto-3
(Aluto-Bobessa)
18 Boseti Although there is a shortage of land in the kebele, majority of households produce adequate amount varieties of crops food thus the kebele is secured as far as food is concerned.
22 Tendaho-2 (Ayrobera)
The community is totally dependent on subsistence livestock. Thus food security in the woreda is seriously threatened. Thus since there is no farming practiced across the kebele, the community is under food relief assistance throughout the year.
Source: ESIA Study Report
4.5.4 Utilization of Water
For development of geothermal energy, accessibility of water is one of the crucial matters to be
confirmed. As mentioned above, water is one of the most serious challenges for nearly half of the
kebeles/sites. For example, two of the kebeles need to travel from 15 to 30 km to fetch water. Even the
sources of water that are easily accessible have not been safe. Only households from three kebeles
claimed the water they consume is safe and clean. Respondents from Meteka, Boset and Arabi reported
they accesses pipe water. However in the case of Boseti, there are times when they face scarcity of water,
particularly from January to May. Table 4.5.4 summarizes the statuses of water access in fifteen
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prospective sites.
Table 4.5.4 Statuses of Water Access in 15 Prospective Sites
Site Water source Distance
(Km) Scarcity period
Water quality For people For animals
Afar region Allalobeda (Tendaho-3) River River 0.5 - 2 - Not safe water
Dallol Pond Pond 25 – 30 All year Not safe water Danab River River - All year Not safe water Damali River River - All year Not safe water Dofan River River 0.5 - 1 - Not safe water Boina Rain/Pond Rain/Pond 15 - 20 April - June Not safe water Kone Lake Lake 0.5 - 1 - Not safe water
Meteka Borehole River 0.5 - Safe water Teo River - - - Not safe water
Ayrobera(Tendaho-2) - - - - - Oromia region
Boseti Pipe Pond 2 Jan - May Safe water Bobessa (Aluto-3) Lake/River Lake/River 7 - Not safe water Finkilo (Aluto-2) Lake/River Lake/River 7 - Not safe water
Gedemsa River River 7 Summer Not safe water Nazareth Birka River 0.5 - Safe water
Somali region Arabi Borehole River 0.5 - Safe water
Source: ESIA Study Report
4.5.5 Displacement and Resettlement
The scale of geothermal energy development project is not yet determined at present, some of the areas
within the prospective sites shall be acquired by the project proponent for implementation of the project.
Data and Information on land clam were collected through interviews at kebele lebel level in the
prospective sites.
Table 4.5.5 below addresses the possible conditions that could lead to displacement of residents before
implementation of the project.
Table 4.5.5 Displacement and Resettlement/Land claim
No. Site Current status
No. of land
owner around the site
Size of the land
owned (ha)
No. of people grazing
around the site
1 Dallol This area of the site is neither exploited for residential houses nor for, farming or grazing. However it is part of the resource for traditional salt mining.
1 1 -
2 Tendaho-3 (Allalobeda)
Allalobeda geothermal project site is found in Dubti woreda in Gurmudela Kebele. The project site is situated 15 km away from Logia town which at 586 km from Addis Ababa. Allallobeda, is not fertile for agriculture due to shortage of rain/water, both for drinking and farming. The community depends on water redirected from Awash River. This Geothermal site is located in an area where there are no residential houses and farming plots. However, the community uses the springs for drinking their animals and grazing livestock. The Tendaho geothermal fields are at an advanced exploration stage, including deep exploratory wells. The site is specifically located within Ayirolef Kebele borders and closely located to Semera Town (9kms NE).
6 6.5 10
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No. Site Current status
No. of land
owner around the site
Size of the land
owned (ha)
No. of people grazing
around the site
3 Boina The site is located at the top of a mountain, very far away from human movement. Thus it is not used for grazing livestock or other related purpose.
0 - -
4 Damali Not residential area around the site - - -
5 Teo Not residential area around the site - - -
6 Danab Not residential area around the site - - -
7 Meteka
The Geothermal site is located within the village of Meteka Kebele where many residential houses and shops are built. There is also an Orthodox Church (St. Mary Church) within the site. In terms of this, therefore, there will be dislocation.
5 12 2
8 Arabi The project site is located about 4 km away from residential areas; therefore, there is no risk of demolishing huts/houses of the community. Grazing lands however could be included in the site.
3 14.5 1
9 Dofan
Dofan geothermal sites are located in the Southern part of Afar Region near Awash River and Melka Werer town. Administratively it is located in Hugub Kebele, Dulecha Woreda. There are two potential geothermal sites which are located on the mountainous caldera/cone created by the Rhyolitic volcanic centers deposition. The woreda town Dulecha is located about 27 km from the site/Dofan. Both the woreda and the kebele are situated in area where public transport is not available. The Predominant land cover types in Dofan and surrounding areas are Intensively Cultivated land, State Farm land, Open Grassland, Open Shrub Grassland and Perennial Marsh. State Farm land (Amibara Farm) and Intensively Cultivated land units are closely located to these geothermal sites. People in the Dofan site live on mainly livestock breeding and very few of them are working in the big sugar cane farms, although the majorities are minorities from different regions.
9 12 4
10 Kone Kone project site is located far from villages; the surrounding area however is used for common grazing.
6 8.5 2
11 Nazareth
There are no residential huts around this site; however the springs located in the middle of farming plots of land belong to different individual farmers. Moreover, an Orthodox Church already claimed two of the thermal pits on which the Church has built bathing rooms.
2 unknown 4
12 Gedemsa The site is located far from residential areas however it is used for grazing livestock. In addition, the site is surrounded by farming plots which belong to individual community members.
1 3 3
14 Aluto-2 (Aluto- Finkilo)
According to the National Geothermal Energy Resource survey map, there are three potential sites in Aluto area, namely Aluto Langano, Aluto Bobessa and Aluto Finkilo. Out of these, Aluto Langano geothermal prospect is under development. These geothermal sites are located south of Lake Ziway (8kms) and north of Lake Langano (9 kms). Administratively Aluto Finkilo geothermal site is located in Golba Aleto kebele and Aluto Bobessa is in Aluto Kebele (Ziway Dugda woreda, Arsi Zone, Oromia Region). Bobessa and Finkilo are located adjacent to each other. Although the actual size of the projects is not yet determined, there are a few huts within the caldera. Besides since the project area is exploited as a grazing land for the same community, unspecified size of the land will be included in the site. In general these sites are densely settled by town residents. Although the actual size of the projects is not yet known, there are few huts within the caldera. Besides since the project area is exploited as a grazing land for the same community, unspecified size of the land will be included in the site.
8 13 7
15 Aluto-3 (Aluto- Bobessa)
7 11.5 2
18 Boseti
Boseti Geothermal site is closely located to Welenchiti town (10km) to south west direction. Administratively Boseti geothermal potential site is located in Gara Dera Kebele, (Boset woreda, East Shewa Zone, Oromia Region). The site also closely located/ along border with Rukecha Boqore & Sifa Bote Kebeles. With regard to elevation,
2 4.5 1
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No. Site Current status
No. of land
owner around the site
Size of the land
owned (ha)
No. of people grazing
around the site
Boseti locality has comparatively high altitude, which ranges 1,250-2,650mts above sea level, while the geothermal site is located on the mountainous caldera/cone created by the Rhyolitic volcanic centers deposition, which have relatively high altitudes around 1,800-2,200 m above sea level. The Predominant land cover types in Boseti and surrounding areas are Dense Shrubland, Intensive Cultivated land, Moderately Cultivated land and Open Shrubland. Boseti geothermal site is specifically located on Dense Shrubland unit with close location with Intensively cultivated lands.
22 Tendaho-2 (Ayrobera)
Not residential area around the site - - -
Total 50
Source: ESIA Report
After the determination of the project site and the project scale, detailed land boundary should be settled
according to the land acquisition procedure of the government of Ethiopia. Site specific adverse impacts,
both on natural and social environment, are summarized in Appendix 4.4.
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4.6 Environmental Management Plan
4.6.1 Environmental Management Plan (EMP)
Environmental Management Plan (EMP) is prepared on the basis of identified impacts and their level of
significance. The objective of this EMP is to identify project specific environmental and social actions
that will be undertaken to manage impacts associated with the development and operation of the
proposed geothermal power plant. Significant impacts that are detailed in the previous section shall be
mitigated through appropriate methods and then subject to mechanisms of environmental management
plan using monitoring and auditing as instrument. Site specific environmental impacts caused by the
implementation of geothermal projects are summarized in Appendix 4.4.
The EMP is to be prepared in the process of EIA study. Detailed mitigation measures and management
plan need to be formulated after determination of the project site, along with techno-economic
feasibility studies. However, it is quite necessary to deal this issue in a comprehensive manner so as to
induce basic requirements for the upcoming project level design and full EIA studies. Table 4.6.1
summarizes the mitigation measures to be taken at the beginnings of construction phase.
Table 4.6.1 Mitigation Measures for EMP
Activities Components Potential Impacts Mitigation Measures Land acquisition Land securing Dislocation of affected
people Project office shall implement all necessary protocols for conversation of land use pattern for the project site from grazing to industrial use.
Relocation of displaced people
It will be ensured that all legal requirements are implemented with respect to Ethiopian regulations pertaining to use of land for industrial use.
Benchmarking Asset dispossession Site boundary will be marked out. It will be ensured that land taken during construction of project is restricted to pre-agreed area.
Change in life style All requisite permits will be obtained prior to project activities.
Disturbance to existing ecosystem
Disturbance to hot spring present around project area will be minimal. The streams shall be protected and preserved and natural drainage pattern shall not be disturbed.
Fencing Loss of vegetation cover Relocation site and/or compensation incentives will be in place based on Ethiopian regulation.
Change in ecology and land use pattern
Plantation of the surroundings area will start with the commencement of construction activities.
Movement of manpower, machinery and materials
Increase in traffic movement
Disturbance to community & its safety
Planning activities in consultation with local communities so that activities with the greatest potential to generate noise are planned during periods of the day resulting in minimum disturbance.
Encroachment of are for parking and construction
Contribution of dust and gaseous pollutants like SO2, NOx, CO, VOC to ambient air quality
Preventive maintenance of vehicles and machinery at regular intervals.
Contribution to ambient noise level
Advice traffic police about the activities. Traffic will be controlled by deploying local people at sensitive accident prone locations who will also oversee the movement of livestock on these roads.
Site leaning, levelling & excavation
Operation of heavy earth moving machinery & equipment
Disturbance to native vegetation and habitats
Plantation of the surroundings area will start with the commencement of construction activities.
Removal of Change in land use All equipment will be operated within specified
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Activities Components Potential Impacts Mitigation Measures vegetation at site pattern design parameters (Site preparation and construction
phases) Piling of soil Disturbance to existing
nearby land users creating visual impact
Regular monitoring of noise level and vibration level due to construction activities at site and in the local areas to conform to the standard as prescribed by most financial institutions.
Storage of oil Increase to ambient noise level
Design additional methods to support already existing business opportunities and community development.
Source: JICA Study Team
4.6.2 Monitoring plan
Environmental monitoring plan is included in the EMP. Environmental monitoring and auditing shall be
undertaken in all phases of project activities to check that the proposed environmental management
measures are being satisfactorily implemented and that they are delivering appropriate level of
environmental performances. Here it might be necessary to emphasize that mitigation measures and
auditing plans are not developed for mere purpose of project licensing but are legally enforcing
document to be followed and performed accordingly throughout project life. A general form of
monitoring plan to be applied to the prospective sites is given in Table 4.6.2 below.
Table 4.6.2 Monitoring Plan for Geothermal Energy Development Project
Impact Method Parameters Monitoring place/location Frequency
Air quality
Measurement/Sample PM/PM10, NOx, SOx Processing stacks Half-yearly Concentration & exposure time Point source of
non-condensable gases Half-yearly
PM/PM10, CO2, Temp., Oxygen level, combustion efficiency
Combustion source Half-yearly
Noise Measurement Leq dB(A) Drilling sites Half-yearly
and upon complaints
Surface and groundwater, if any
Sampling Temp., pH, Oil, SS, COD Groundwater wells, Oil/grease traps, water separators, sedimentation tanks
Quarterly
Soil
Sampling Moisture content, pH, salinity, N, P, Cl, K, Na
Agricultural plots near and in projects sites
Annual
Heavy metals (Mn, Fe, etc.) Every three years
Domestic solid waste Audit, photographic documentation, interviews
Generation, storage, recycling, transport and disposal
Plant premises Quarterly
Biodiversity Visual inspection and photographic documentation
General condition of the floral cover
Plant and landscaped areas
Annual
Resource use
Metering Water and energy consumption Plant and surrounding areas
Continuously
Audit Raw material consumption Plant and surrounding areas
Continuously
Health and safety
Health and safety survey Proper use of PPE, presence of safety signs, firs aid kit, fire fighting devices, injury illness records, emergency exit and plans, Accident statistics recording in accordance with ILO standards.
Plant road linking plant to project site
Continuously
Socio-economic Field questionnaire Local population an Authorities Plant and surrounding
areas Annually
Interviews Employment records and Plant Continuously Nippon Koei Co., Ltd. JMC Geothermal Engineering Co., Ltd Sumiko Resources Exploration & Development Co., Ltd.
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Impact Method Parameters Monitoring place/location Frequency Worker association
Operations monitoring
Visual inspection and documentation
Production rate, gas flow rates, counter readings, pressure valves, temperatures, abnormal readings, overloads, stoppages
All facilities and major equipment at Plant area
Daily
Source: JICA Study Team
4.7 Consultation with stakeholder
Stakeholder Consultations were implemented in the ESIA Study, namely at scoping stage, through the
interviews at communities (March –July 2014).
Stakeholder Consultation at scoping stage
Consultation with stakeholder at the prospective sites had been conducted through interview and using
questionnaires shown in section 4.3.1 (Methodology of Baseline Study) in the ESIA study. As
mentioned in section 4.3.1, hearings and questionnaire surveys had been conducted at seven Woreda
level sector offices, and more than 100 officials from different sectors were participated. The contents of
questions developed for the survey and the stakeholder consultation are summarized as follows:
Existence of any directive/guidelines in the offices relevant for establishment and resource
utilization around the proposed project areas.
Existence of development plan in or around the proposed project area.
Personal opinion of interviewee on establishment of this geothermal energy development project in
the area.
Together with above, themes of discussion developed for group discussion are as follows:
Have you heard about geothermal energy?
What are the major constrains of the community?
What potential benefits do you expect from the geothermal project?
What potential negative impacts do you expect from the geothermal project?
If there are negative effects of the project what do you recommend avoid/minimize the impacts?
Are there minority groups in the area, and what problems do they face?
Is there conflict story due to resource or other causes among the community?
If the project requires relocation of people, do you think the concerned group will agree?
In what form do you think the relocated households should/want to receive the compensation?
Any other comments
As results of the stakeholder consultations, the discussions with local people were almost same for the
prospective areas as follows:
Up to now there is no directives that prevent the geothermal energy development projects from
establishment along the proposed sites.
For the establishment of the project, necessary precautionary measures for resource utilization
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should be taken.
All of interviewed officials expressed their positive support for establishment of the geothermal
energy development projects with necessary measures.
Together with the opinion of officials above, meeting with people who had potential directly affected by
the project revealed the following opinions:
Fear of losing farm lands and inability to get lands of equivalent land conditions.
Fear of losing free large grazing land for livestock.
Fear of declining cattle population due to shortage of such grazing land elsewhere and its
implication on family income.
Fear of losing plain playground of their children.
Loss of proximity to nearby town social facilities such as big market, health center, access to
transport service, etc.
Fear of getting appropriate compensation for their assets.
In order to remove the issues and concerns of the community above, due regards and detailed
explanations were given to the community based on the legal, social and environmental land regulations
stated in the proclamation of Federal Republic of Ethiopia No. 1/1995.
Names, responsibilities and status of respondents and interviewees are listed in Appendix 4.6.
4.8 Conclusion and Recommendation
4.8.1 Conclusion
The environment and social impact assessment study on the geothermal energy development was
conducted. The study included site surveys and collection of readily available data for the prospective
sites, and IEE for scoping of potential impacts caused by the implementation of geothermal energy
development projects. The study revealed the followings:
Although implementation of geothermal energy development project will affect some
environmental and social impacts on the sites, both positive and negative, there are no prospective
sites which would be affected negative impacts seriously by the implementation of the geothermal
energy development project in terms of the environment.
According to the stakeholder consultation conducted at the prospective sites of Woreda level, all
of interviewed officials expressed their positive support for development of the geothermal
energy with necessary measures such as proper land compensation.
The stakeholder consultation also revealed that the main concern of potentially project affected
people (PAP) is fear of losing farm land, grazing land for livestock. Due regards and detailed
explanations should be made to PAPs in case the geothermal energy development projects are to
implement at some of the prospective sites.
As for the gaps between Ethiopian Legislations and JICA Guidelines (2010) for policies on
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Environmental Assessment, it can be concluded that the JICA Environmental guidelines and the
legislation in Ethiopia do not have major contradictions as well as Safeguard Polices in the World
Bank, except perhaps certain procedural adjustments during project implementation such as public
consultation and public disclosure. The studies on policy aspects in this study showed that the
projects for geothermal energy development were classified under CATEGORY I by the Ethiopian
environmental project categorization. This means that the geothermal energy development
projects are required to conduct a full EIA study complying with national standards set by the
country.
The National Energy Development Policy in Ethiopia states that; i) Equitable development of the
energy sector together with other social and economic developments, and ii) Development of
indigenous resources with minimum environmental impact and equitably distribution of
electricity in all the regions. In addition to the National Energy Development Policy mentioned
above, the National Environmental Policy also states to promote the development of renewable
energy sources and reduce the use of fossil energy resources both ensuring sustainability and for
protecting the environment, as well as for their continuation into the future.
Geothermal energy is one of the environmental sound indigenous renewable energies in Ethiopia.
Proceedings of geothermal energy development comply with the national policies of Ethiopia.
4.8.2 Recommendation
Geothermal energy development projects which have an electricity generation capacity more than 25
MW are required the implementation of full scale EIA in accordance with EIA related laws and
regulations of Ethiopia prior to the implementation of the project. As shown in section “4.2
Environmental Laws and Regulations”, EIA process consists of series of several procedural phases
starting from pre-screening consultation with EPC and submission of a screening report and ending up
by obtaining an EIA approval. The project proponent should start the EIA procedures in cooperation
with other sectoral agencies such as Ministry of Water, Irrigation and Energy (MoWIE), regional
governments, etc. For the implementation of the EIA, followings should be noted:
EIA should be conducted in accordance with the Ethiopian EIA process.
EIA should be carried out for the selected site by the project proponent according to the Ethiopian
Guidelines and/or international requirements.
After the determination of the project site(s), EIA should start prior to the test drillings, and
continuously conducted parallel to the test drilling.
The EIA report prepared based on above shall be revised considering the results of the test
drilling above. Results of ESIA survey conducted in this master plan study can be utilized for the
implementation of the EIA
Additional EIA should be conducted if necessary according to the revised EIA report.
The EIA is to be conducted considering the specific features of environmental impacts of
geothermal energy development.
EIA approval should be obtained before the application of the development right of the project.
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CHAPTER 5 Formulation of Master Plan
5.1 Target and Methodology
The master plan is formulated by first setting out the development targets (how much installed capacities
are required and when) and then by prioritizing the identified candidate projects using a multi-criteria
analysis to meet the targets set out.
5.1.1 Target of the Master Plan
Table 5.1.1 gives the development targets for this master plan. Target year is set as the same period as
in the EEP master plan. In order to make the plan more concrete, the master plan period is divided into
three terms, namely: short, medium, and long. First, the committed and ongoing projects are expected
to be completed in the short term. Secondly, high priority prospects aim to develop around 500 MW in
the exact same way as in the EEP generating plan. And last, a total of 5,000 MW of geothermal power
is expected to be developed in the long term in Ethiopia.
Table 5.1.1 Development Target of the Master Plan
Item Target Remarks
Period
2015–2037 (23 years) Short term: 2015-2018 (4 years) Medium term: 2019-2025 (7 years) Long term: 2026-2037 (12 years)
EEP MP: 2013–2037 (25 years) Wind and Solar MP: 2011–2020 (10 years)
Installed Capacity Short term 700 MW Committed and ongoing sites Medium term 1,200 MW Same target as EEP MP Long term 5,000 MW Same target as EEP MP
MP: Master Plan Source: JICA Project Team
5.1.2 Methodology of the Master Plan
This master plan is formulated by prioritizing the 22 geothermal prospects identified based on the
results of various kinds of geological survey and collected data from past surveys, using multi-criteria
analysis. The multi-criteria analysis is the method of prioritizing the candidate projects by screening
and ranking them using multiple criteria as shown in Figure 5.1.1. Five criteria are used: (i)
development status, (ii) environmental risks, (iii) geothermal potential, (iv) economics, and (v) site
specific factors. First, depending on the development status and commitment of the donors, the
committed prospects are prioritized by giving them a high rank. In the following screening, the
prospect which has severe adverse environmental impact, for example those located in the national
park, is given low priority. Other sites are ranked based on economics estimated using geothermal
potential, installed capacity, drilling well, plant cost, and other required facilities. And finally, taking
into consideration site specific factors such as other socio-environmental impacts, minor arrangement
of the ranking is discussed.
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Source: JICA Project Team
Figure 5.1.1 Flow of Multi-Criteria Analysis
5.2 Multi-Criteria Analysis for Prioritizing the Geological Prospects
5.2.1 Factors to be Considered
(1) Development Status
In general, with the progress of the development status, the reliability of the geothermal resource is
increased. Using the Australian Geothermal Reporting Code Committee 1 classification, the
development status and geothermal reliability of the 22 geothermal prospects are evaluated and
categorized into three sections, namely: 1) measured, 2) indicated, and 3) inferred geothermal
resource.
Table 5.2.1 shows the development status of the 22 geothermal prospects. Aluto-1 (Aluto-Langano)
and Tendaho-1 (Dubti), where some test drillings were already done, are evaluated as measured and
1 Global Review of Geothermal Reporting Terminology, Feb. 2013, Hot Dry Rocks Pty Ltd
Screening-1Development Status
Start
Ranking-1Geothermal Knowledge and Potential
Screening-2Environmental and Social Impact(National Park)
The sites which are at advanced development stage and donor involvement are given high priority.
Ranking-2Project Economics
Ranking-3Site Specific Factor
Prioritizationof 22 Geothermal Prospects
The sites which have high potential and high reliability are given high priority.
The sites which have high economics (lower generation cost and higher EIRR) are given high priority.
The sites which have advantages in terms of environmental/social impacts, required grid, accessibility to the site, security situation, direct thermal use and regional demand, etc. are given high/low priority.
The sites which have immitigable adverse environmental risks/impacts such as locating in national parks are given low priority.
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indicated resource, respectively. Other sites where any detailed exploration surveys have yet to be
done are evaluated as inferred resource.
Table 5.2.1 Development Status and Geothermal Resource
Site Temperature
Class Geothermal Resource
Inferred Indicated Measured 1 Dallol B 44 N/A N/A 2 Tendaho-3 (Allalobeda) A 120 N/A N/A 3 Boina C 100 N/A N/A 4 Damali C 230 N/A N/A 5 Teo B 9 N/A N/A 6 Danab B 11 N/A N/A 7 Meteka B 130 N/A N/A 8 Arabi C 7 N/A N/A 9 Dofan B 86 N/A N/A 10 Kone D 14 N/A N/A 11 Nazareth C 33 N/A N/A 12 Gedemsa D 37 N/A N/A 13 Tulu Moya C 390 N/A N/A 14 Aluto-2 (Finkilo) A 110 N/A N/A 15 Aluto-3 (Bobesa ) A 50 N/A N/A 16 Abaya B 790 N/A N/A 17 Fantale C 120 N/A N/A 18 Boseti B 265 N/A N/A 19 Corbetti B 1000*1 N/A N/A 20 Aluto-1 (Aluto-Langano) A 16 70*2 5 21 Tendaho-1 (Dubti) A 280 10*3 N/A 22 Tendaho-2 (Ayro Beda) A 180 N/A N/A
N/A: Not available *1 Reykjavík Geothermal *2 Study on Geothermal Power Development Project in the Aluto Langano Field, Ethiopia, METI (Japan), 2010, *3 Consultancy Services for Tendaho Geothermal Resources Development feasibility Study, ELC, 2013
Source: JICA Project Team
(2) Socio-environmental Impact
According to the environmental and social consideration study mentioned in Chapter 4, Fantale
geothermal prospect is located around the Awash National Park and it is expected that it will be
difficult to develop. Therefore, Fantale prospect is given a low priority in the ranking. With the
exception of Fantale prospect, the 21 other geothermal sites do not encroach on the range of the
national park and do not have immitigable adverse environmental risks and impacts.
(3) Geothermal Potential
Based on the various geological surveys carried out in this study, geothermal potential of each site is
assessed and discussed in Chapter 3. The result of the reservoir assessment is summarized in Table
5.2.1. As per the electrical development plan mentioned in Chapter 2, the electrical demand is
forecasted to increase much higher than the sum of hydropower and geothermal potential in the early
2030s. Therefore, EEP requests the development of the maximum possible geothermal potential. In
this study, the installed capacity of each power plant is set as equal to the geothermal potential in each
prospect.
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As mentioned in Section 2.4, several donors have started development and drilling surveys of some of
the prospects, such as Corbetti, Aluto-1 (Aluto-Langano), and Tendaho-1 (Dubti). The inferred
potential of Corbetti geothermal prospect is estimated at 1000 MW referring to publicly available
information from Reykjavík Geothermal (RG). Similarly, the indicated and measured potential of
Aluto-1 (Aluto-Langano) and Tendaho-1 (Dubti) were taken from the existing simulation studies.
The reservoir temperature of Kone and Gedemsa prospects are assumed to be very low (100~170 °C
based on the geochemical analysis) that those prospects cannot use flash-type generation but only
binary-type generation. Therefore, plant construction cost of Kone and Gedemsa prospects are
expected to be higher than any other prospects with Class A and B reservoir temperatures.
(4) Economics of Candidate Plants
The project economics are measured by two indicators: (i) generation cost and (ii) economic viability.
1) Cost of Electricity Generation
To compare the competing power plants (geothermal, hydropower and other plant types), the
electricity generation costs (cost of generation) per kWh are calculated. Here the generation cost is
defined as the sum of annualized capital cost and annual O&M cost of power plants, divided by the
annual power production (kWh). The capital costs are annualized using a discount rate (social
opportunity cost of capital) of 10% for the economic life. All the costs are expressed in 2012 price.
The capital cost consists of direct costs (preparatory work, well drilling, fluid collection and
reinjection system (FCRS), and power plant construction), indirect cost, and interest during
construction (IDC).
The direct costs except for geothermal power plant are estimated from past results and plans provided
by EEP. The economic life and plant factor of each power plant used for the calculation of capital
recovery factor and electricity production are shown in the tables below. The economic life of
geothermal power plants is adopted from the worldwide standard of “30 years”, and that of
non-geothermal power plants is taken from the adopted value in the EEP master plan study.
Plant factor of geothermal power plants is taken as “90%”, adopted from standard geothermal power
plants, and that of wind farms is taken from the past records of Adama and Ashegoda wind farms,
while those for hydropower and other power plants are taken from the planned value in EEP master
plan.
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Table 5.2.2 Economic Life
Plant Type Economic Life Time
(years) Geothermal 30 Hydropower 75 Wind 20 Solar 40 Energy from Waste 30 Biomass 25 Diesel 20 Gas Turbine 20 CCGT 25
Source: JICA Project Team
Table 5.2.3 Plant Factor
Plant Type Plant Factor
(%) Geothermal 90.0 Hydropower 20.0 ~92.0 Wind 26.4 ~33.6 Solar 20.0 Energy from Waste 84.9 Biomass 23.9~27.5 Diesel 84.0 Gas Turbine 90.0 CCGT 87.5
Source: JICA Project Team
Table 5.2.4 gives the costs generation by the candidate hydropower plants which are calculated based
on the basic data given by EEP. The generation costs of the candidate hydropower plants vary from
US$0.02-0.15/kWh. Most of the candidate hydropower plants have more than 100 MW of installed
capacity and are comparatively economical.
Table 5.2.4 Generation Costs of Candidate Hydropower Plants
Source: JICA Project Team (Data of candidate plants was given by EEP)
Table 5.2.5 presents the generation costs of other renewable energy and thermal power plants. The
costs of Adama I and Ashegoda II wind farms are lowest and estimated at US$0.084-0.090/kWh.
Following these, Bazma Biomass Power Plant has a lower generation cost. Except for the wind farm
above, generation costs of all plants exceed US$0.10/kWh and are less economical than most of the
candidate hydropower plants.
RankingOrder
CandidateHydropower Plant
InstalledCapacity
(MW)
PlantFactor
(%)
EnergyProduction(GWh/year)
ConstructionCost
(mil $)
IDC Cost(mil $)
Total Cost(mil $)
AnnualizedCapital Cost(mil $/year)
O&M Cost(mil $/year)
AnnualizedCost
(mil $/year)
Cost ofGenaration ($/kWh)
1 Beko Abo 935 81% 6632 1260.8 441.3 1702.1 126.18 12.6 138.79 0.02092 Genji 216 49% 910 197.6 69.1 266.7 19.78 2.0 21.75 0.02393 Upper Mendaya 1,700 58% 8582 2436.4 852.7 3289.1 243.83 24.4 268.20 0.03124 Karadobi 1,600 60% 7857 2576.0 901.6 3477.6 257.80 25.8 283.56 0.03615 Geba I + Geba II 372 57% 1709 572.0 200.2 772.2 57.25 5.7 62.97 0.03686 Genale VI 246 74% 1532 587.9 205.8 793.7 58.84 5.9 64.72 0.04227 Gibe IV 1,472 50% 6146 2588.3 776.5 3364.8 259.03 25.9 284.92 0.04648 Upper Dabus 326 51% 1460 628.2 219.9 848.1 62.87 6.3 69.15 0.0474
11 Sor II 5 92% 39 18.6 3.7 22.3 1.86 0.2 2.05 0.053210 Birbir R 467 70% 2724 1231.1 369.3 1600.4 123.21 12.3 135.52 0.04979 Halele + Werabesa 436 54% 1973 886.0 310.1 1196.1 88.67 8.9 97.53 0.0494
12 Yeda I + Yeda II 280 45% 1089 540.2 189.1 729.3 54.06 5.4 59.46 0.054613 Genale V 100 66% 575 297.7 89.3 387.0 29.79 3.0 32.77 0.057014 Gibe V 660 36% 1905 1036.9 311.1 1348.0 103.77 10.4 114.14 0.059915 Baro I + Baro II 645 46% 2614 1595.9 558.6 2154.5 159.72 16.0 175.67 0.067217 Lower Didessa 550 20% 976 619.2 185.8 805.0 61.97 6.2 68.16 0.069916 Tekeze II 450 69% 2721 1690.4 591.6 2282.0 169.17 16.9 186.08 0.068418 Gojeb 150 48% 562 526.8 184.4 711.2 52.72 5.3 57.99 0.103219 Aleltu East 189 53% 804 760.6 266.2 1026.8 76.12 7.6 83.73 0.104120 Tams 1,000 69% 6057 5814.9 2035.2 7850.1 581.95 58.1 640.10 0.105722 Abu Samuel 6 30% 16 18.5 2.8 21.3 1.85 0.2 2.04 0.129721 Aleltu West 265 46% 1067 1180.5 413.2 1593.7 118.14 11.8 129.95 0.121823 Wabi Shebele 88 91% 691 887.8 221.9 1109.7 88.85 8.9 97.73 0.141424 Lower Dabus 250 29% 637 866.3 259.9 1126.2 86.70 8.7 95.36 0.1497
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Table 5.2.5 Generation Costs of Non-Hydro and Non-Geothermal Plants
Source: JICA Project Team (Data of each power was given by EEP)
The construction cost of geothermal power plants mainly consists of well drilling, FCRS, and power
plant construction. Power plant construction and FCRS are estimated depending on the planned
installed capacity, while the cost of well drilling is estimated based on target well depth in resource
development, steam and brine flow per production well and the characteristics (depth and temperature)
of the geothermal reservoir, taking into consideration geothermal models and characteristics of each
prospect mentioned in Chapter 3. Regarding Aluto-1 and Corbetti, their construction costs are taken
from the outgivings based on a more detailed study conducted in the past.
The JICA Project Team conducted well simulation to determine the relation between reservoir
temperature and steam and brine flow per production, setting depth, pressure, and permeability of
geothermal reservoir. Well drilling cost is estimated based on the simulation result and well depth
based on previous survey results. Figure 5.2.1 presents the relation between reservoir temperature and
power output converted from flow rate. Although it differs largely depending on the permeability, the
result suggests higher reservoir temperature has a larger amount of steam and brine flow and bigger
power output per production well.
Source: JICA Project Team
Figure 5.2.1 Well Simulation Results
Plant Type Candidate PlantInstalledCapacity
(MW)
PlantFactor
(%)
EnergyProduction(GWh/year)
ConstructionCost
(mil $)
IDC Cost(mil $)
Total Cost(mil $)
AnnualizedCapital Cost(mil $/year)
O&M Cost(mil $/year)
AnnualizedCost
(mil $/year)
Cost ofGenaration ($/kWh)
Wind Farm Adama-I 51.0 33.6% 150 96.9 9.7 106.6 11.38 1.3 12.66 0.0844Wind Farm Adama-II 30.0 26.6% 70 57.0 5.7 62.7 6.70 0.8 7.45 0.1064Wind Farm Ashegoda-I 90.0 26.4% 208 171.0 17.1 188.1 20.09 2.3 22.34 0.1074Wind Farm Ashegoda-II 153.0 31.6% 424 290.7 29.1 319.8 34.15 3.8 37.97 0.0896Solar EEPco MP 300.0 20.0% 526 540.0 54.0 594.0 55.22 7.5 62.72 0.1192Energy from Waste EEPco MP 25.0 84.9% 186 144.0 7.2 151.2 15.28 32.1 47.35 0.2545Biomass Bazma 120.0 27.5% 289 183.7 9.2 192.8 20.23 11.1 31.30 0.1083Biomass Meikasedi 138.0 23.9% 289 203.4 10.2 213.6 22.41 12.4 34.83 0.1205Diesel (HFO) EEPco MP 70.0 84.0% 515 144.2 14.4 158.6 15.89 92.7 108.59 0.2108Gas Turbine EEPco MP 140.0 90.0% 1104 70.0 10.5 80.5 8.22 140.2 148.43 0.1344CCGT EEPco MP 420.0 87.5% 3219 525.0 78.8 603.8 57.84 292.9 350.77 0.1090
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
16.0
18.0
20.0
160 180 200 220 240 260 280 300 320
Pow
er o
utpu
t (M
W)
Reservoir Temperature (℃)
kh=0.5 darcy-m
kh=2 darcy-m
kh=5 darcy-m
Class A
Class B
Class C
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The success rate of well drilling is also assumed to be 80% for the Aluto and Tendaho (Dubti and
Ayrobera) area, where a study on depth and scale of geothermal reservoir was done, and 70% for the
other sites at the initial stage. Based on the productivity of one production well and the success rate,
the necessary number of production and reinjection wells is calculated. The diameter of production
well is uniformly set at 8.5 inches at the bottom of the well which is the standard and applied in the
past in Ethiopia. The drilling cost is given by multiplying the unit cost (US$1,750/m) which is
determined with worldwide standard price 2 assuming fully contracting out. In case that GSE
implements the drilling by his own rigs and equipments, the drilling cost is assumed to lower around
US$1,500/m. In this case, the generation costs also come down with about US$0.003-0.013/kWh as
shown in Table 5.2.6.
The power plant construction cost including FCRS is calculated assuming a 3-year construction period
within the total development period of six years similar to the implementation plan shown in Section
5.3 and in reference to the model case of 70 MW power plants, which costs US$14 million in EEP
master plan.
Table 5.2.6 shows the generation cost of the geothermal plants. As mentioned above, Kone and
Gedemsa, which are assumed to have low reservoir temperatures, can use only binary-type generation.
Therefore, they are excluded from the calculation of generation cost for flash-type geothermal power
plants. As a result of the estimation, the generation costs in Aluto and Tendaho area, which are
assumed to have high reservoir temperatures, are US$0.05-0.06/kWh and the lowest for all prospects.
Corbetti, where RG already holds the license, is also US$0.059/kWh and more economical. Following
them, Abaya, Boseti and Meteka, with large geothermal potential, are estimated to be US$0.07/kWh
and economical. On the other hand, although Teo, Dallol, and Danab are assumed to have Class-B
reservoir temperature, their generation costs are estimated to be more than US$0.10/kWh and less
economical. It is caused by large cost for access as it was impossible for the JICA Project Team to
conduct the site survey. The generation costs of Tulu Moye, Fantale, Nazareth, Damali, Boina, and
Arabi, which are assumed to have Class-C reservoir temperature, are very high because of necessary
large number of well and estimated more than US$0.10/kWh and less economical.
2 Geothermal Handbook: Planning and Financing power generation, Energy Sector Management Assistance Program, World Bank, June 2012
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Table 5.2.6 Generation Costs of Geothermal Power Plants
Source: JICA Project Team
To sum up the estimation of generation cost, the rank order of the geothermal prospects is summarized
Table 5.2.7. Among 22 prospects, Aluto and Tendaho area are ranked highest except for Corbetti
where RG has development license, and followed by Abaya. In addition to Aluto and Tendaho area,
Boseti and Meteka, located between Aluto and Tendaho in the Great Rift Valley, are also ranked high.
Table 5.2.7 Ranking Order of the Geothermal Prospects
Source: JICA Project Team
In this master plan study, geothermal potential, which was not done in EEP master plan, has been
assessed. In the comparison between the generation cost of hydropower and other plant types and that
of geothermal based on the geothermal potential, the revised development prioritization of all plant
types is proposed.
Figure 5.2.2 and Figure 5.2.3 compares the generation costs of geothermal and hydropower, and
RankingOrder
Geothermal SiteInstalledCapacity
(MW)
PlantFactor
(%)
EnergyProduction(GWh/year)
ConstructionCost
(mil $)
IDC Cost(mil $)
Total Cost(mil $)
AnnualizedCapital Cost(mil $/year)
O&MCost
(mil $/year)
AnnualizedCost
(mil $/year)
Cost ofGenaration ($/kWh)
Cost of GenarationDrilled by GSE
($/kWh)15 Dallol 44 90 346.9 321.5 48.2 369.7 34.10 3.2 37.32 0.1076 0.10196 Tendaho-3 (Allalobeda) 120 90 946.1 506.4 76.0 582.3 53.72 5.1 58.78 0.0621 0.0584
18 Boina 100 90 788.4 754.7 113.2 867.9 80.06 7.5 87.60 0.1111 0.110716 Damali 230 90 1,813.3 1,693.1 254.0 1,947.1 179.61 16.9 196.54 0.1084 0.105613 Teo 9 90 71.0 63.6 9.5 73.1 6.74 0.6 7.38 0.1040 0.097119 Danab 11 90 86.7 127.0 19.1 146.1 13.47 1.3 14.74 0.1700 0.164310 Meteka 130 90 1,024.9 645.3 96.8 742.1 68.45 6.5 74.90 0.0731 0.067420 Arabi 7 90 55.2 89.0 13.3 102.3 9.44 0.9 10.33 0.1872 0.320011 Dofan 86 90 678.0 457.4 68.6 526.0 48.52 4.6 53.09 0.0783 0.0726- Kone 14 90 110.4 - - - - - - -
17 Nazareth 33 90 260.2 244.5 36.7 281.2 25.94 2.4 28.38 0.1091 0.1051- Gedemsa 37 90 291.7 - - - - - - -
12 Tulu Moye 390 90 3,074.8 2,748.0 412.2 3,160.2 291.51 27.5 318.99 0.1037 0.09462 Aluto-2 (Finkilo) 110 90 867.2 437.0 65.6 502.6 46.36 4.4 50.73 0.0585 0.05494 Aluto-3 (Bobesa) 50 90 394.2 201.1 30.2 231.3 21.34 2.0 23.35 0.0592 0.05568 Abaya 790 90 6,228.4 3,849.1 577.4 4,426.4 408.31 38.5 446.80 0.0717 0.0663
14 Fantale 120 90 946.1 855.4 128.3 983.7 90.74 8.6 99.30 0.1050 0.09999 Boseti 265 90 2,089.3 1,298.1 194.7 1,492.9 137.71 13.0 150.69 0.0721 0.06653 Corbetti 1000 90 7,884.0 4,000.0 600.0 4,600.0 424.32 40.0 464.32 0.0589 0.05897 Aluto-1 (Langano) 75 90 591.3 356.7 53.5 410.2 37.84 3.6 41.41 0.0700 0.07001 Tendaho-1(Dubti) 290 90 2,286.4 1,126.6 169.0 1,295.6 119.51 11.3 130.78 0.0572 0.0538
5 Tendaho-2 (Ayrobera) 180 90 1,419.1 725.0 108.7 833.7 76.90 7.2 84.15 0.0593 0.0570
RankingOrder
Geothermal SiteTemp.Class
InstalledCapacity
(MW)
Cost of Genaration
($/kWh)Remarks
1 Tendaho-1(Dubti) A 290 0.0572 Shallow reservoir is committed.2 Aluto-2 (Finkilo) A 110 0.05853 Corbetti B 1,000 0.0589 Committed site4 Aluto-3 (Bobesa) A 50 0.05925 Tendaho-2 (Ayrobera) A 180 0.05936 Tendaho-3 (Allalobeda) A 120 0.0621 Committed site7 Aluto-1 (Langano) A 75 0.0700 Committed site8 Abaya B 790 0.07179 Boseti B 265 0.0721
10 Meteka B 130 0.073111 Dofan B 86 0.0783
12 Tulu Moye C 390 0.1037
13 Teo B 9 0.104014 Fantale C 120 0.105015 Dallol B 44 0.107616 Damali C 230 0.108417 Nazareth C 33 0.109118 Boina C 100 0.1111
19 Danab B 11 0.1700
20 Arabi C 7 0.1872- Gedemsa D 37 - Low temperature- Kone D 14 - Low temperature
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geothermal and other power plants respectively. Generally, the generation cost of hydropower is lower
than that of geothermal power plants. However, some geothermal power plants are much more
competitive and are more reasonable than some candidate hydropower plants with similar capacity.
Prospects in Aluto and Tendaho area and Corbetti, with generation cost of around US$0.05-0.07/kWh,
are as competitive as the most economical candidate hydropower plants. Abaya, Boseti, Meteka, and
Dofan, whose generation costs are around US$0.07-0.08/kWh are also competitive and just above the
range of reasonable hydropower plants.
In comparison with other renewable energy and thermal power plants, even Adama and Ashegoda
wind farms, which are the most reasonable and exceeds US$0.08/kWh, they are not competitive
compared with the geothermal prospects ranked No.1 to No.11 in Table 5.2.7. Therefore, from the
point of view of least cost generation, geothermal must be prioritized over wind and solar in Ethiopia.
As mentioned in section 2.3.4, wind and solar power is unreliable which is influenced by climate and
weather conditions. Meanwhile, geothermal resource provides reliable electrical supply as base load.
Moreover, the Ethiopia’s energy sector is overly depending on hydropower, which is exposed to
drought risk. To reduce risk of drought, the geothermal resources should be exploited as much as
possible. This will improve Ethiopia’s energy mix, where the base load could be supported by
geothermal energy and the peak load by hydropower. .
The geothermal prospects with generation cost of US$0.10/kWh are almost equal to wind and solar
and more economical than gas turbine and diesel. The diesel generation and waste from energy are
much more expensive than the geothermal prospects.
Source: JICA Project Team
Figure 5.2.2 Generation Cost of Geothermal and Hydropower Plants
0.0000
0.0500
0.1000
0.1500
0.2000
0 100 200 300 400 500 600 700 800 900 1000
Cos
t of G
ener
atio
n (
$/kW
h)
Geothermal Site CandidateHydropower Plant
Installed Capacity (MW)
Aluto-Langano
Abaya
Corbetti
MetekaBoseti
Tulu Moye
Dubti
Damali
Allalobeda
FinkiloAyrobera
Bobesa
Dofan
Boina
Teo
Danab
Arabi
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Source: JICA Project Team
Figure 5.2.3 Generation Cost of Geothermal and Other Power Plants
If the Government of Ethiopia adopts preferential policy such as advantageous interest rate to promote
geothermal development, geothermal is expected to become more competitive. In this master plan,
based on the comparison of the generation cost of plant type, generation plan of geothermal power
plants is proposed to the EEP master plan which has a rough plan for geothermal development.
2) Economic Viability
The economic viability of a geothermal plant is evaluated using the economic internal rate of return
(EIRR). The EIRR is obtained by cost/benefit analysis using the cost of the geothermal plant as the
cost and the cost of the alternative plant (diesel plant) as the benefit. The EIRR is a discount rate at
which the present values of the streams of the cost and benefit are equal. The calculated EIRR is
compared with the social opportunity cost of capital taken at 10%. The project is economically
feasible if the EIRR is 10% or more.
The basic assumptions used for calculating the cost and benefit of the Tendaho-2 (Ayrobera)
geothermal plant as an example are summarized as follows:
0.0000
0.0500
0.1000
0.1500
0.2000
0.2500
0.3000
0 100 200 300 400 500 600 700 800 900 1000
Cos
t of G
ener
atio
n (
$/kW
h)
Installed Capacity (MW)
Geothermal Site Wind Farm
Solar Energy from Waste
Biomass Gas Turbine
Diesel (HFO) CCGT
Aluto-Langano
Abaya
Corbetti
Meteka Boseti
Tulu Moye
Dubti
Damali
Allalobeda
Finkilo Ayrobera
Bobesa
DofanWind-Ashegoda
Wind-AdamaSolar
Energy from Waste
CCGT
Diesel (HFO)
Gas Turbine
Boina
Teo
Danab
Arabi
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Table 5.2.8 Basic Assumptions Used for Economic Evaluation of Tendaho-2 (Ayrobera)
Geothermal Plant (Cost) Alternative Diesel Plant (Benefit)
Installed capacity: 180 MW Plant factor: 90% Station use: 9% Economic life: 30 years Generated energy: 1,419.1 GWh Sales energy: 1,291.4 GWh Construction cost: US$725.0 million (2012 price) O&M cost: US$7.2 million/year (2012 price)
Installed capacity: 229 MW Plant factor: 67% Station use: 4% Economic life: 15 years Generated energy: 1,345.2 GWh Sales energy: 1,291.4 GWh Unit construction cost: US$800/kW (2012 price) Construction cost: US$183.4 million (2012 price) Fuel cost: US$0.171/kWh (2012 price) O&M cost: US$ 0.009/kWh (2012 price)
Source: JICA Project Team
The cost/benefit streams for the top five ranked plants (Tendaho-1, Aluto-2, Tendaho-2, Aluto-3, and
Tendaho-3) are appended.
The EIRRs are given in Table 5.2.9 (ranking of geothermal power plants). Out of 18 projects, 16 are
economically viable since the EIRRs are more than the hurdle rate of 10%. Two projects (Danab and
Arabi) are not economically viable as the EIRRs are below the hurdle rate. As seen from the table, the
costs of energy and the EIRRs are perfectly correlated: the lower the cost of energy, the higher the
EIRR.
Table 5.2.9 Ranking of Geothermal Power Plants and EIRR
Source: JICA Project Team
RankingOrder
Geothermal SiteInstalledCapacity
(MW)
Cost ofGenaration ($/kWh)
EIRR(%)
1 Tendaho-1(Dubti) 290 0.0572 31.7%
2 Aluto-2 (Finkilo) 110 0.0585 31.1%
3 Corbetti 1,000 0.0589 -
4 Aluto-3 (Bobesa) 50 0.0592 30.7%
5 Tendaho-2 (Ayrobera) 180 0.0593 30.8%
6 Tendaho-3 (Allalobeda) 95 0.0621 29.1%
7 Aluto-1 (Langano) 75 0.0700 -
8 Abaya 790 0.0717 25.2%
9 Boseti 265 0.0721 25.0%
10 Meteka 130 0.0731 24.7%
11 Dofan 86 0.0783 23.1%
12 Tulu Moye 390 0.1037 17.0%
13 Teo 9 0.1040 17.4%
14 Fantale 120 0.1050 16.7%
15 Dallol 44 0.1076 16.6%
16 Damali 230 0.1084 16.2%
17 Nazareth 33 0.1091 16.2%
18 Boina 100 0.1111 15.8%
19 Danab 11 0.1700 9.9%
20 Arabi 7 0.1872 8.7%
- Gedemsa 37 - -
- Kone 14 - -
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3) Site Specific Factors
i) Socio-environmental Impact
Social and environmental impact, except for national park, is taken into consideration for the
prioritization.
Environmental and social consideration study was conducted in this study. In the study, and also
when the JICA Project Team visited and surveyed the site, it was determined that there may be a
potential conflict with local people in the Dofan prospect. Therefore, Dofan is adjusted to be
ranked below the level of the economy group.
ii) Accessibility to the National Grid
The required length of transmission line from the geothermal aspects to existing national
grid/substation is measured after verification of the exact geothermal manifestation by site survey
in this study. Table 5.2.10 shows the length and voltage of the required transmission line and
substation which was examined based on the geothermal potential and installed capacity.
The extension of the national grid is to be implemented by EEP; therefore, the cost of the
extension is not included in the project cost estimated above. Taking into account the accessibility
to the national grid, the prioritization of the geothermal sites is reassessed. However, except for
prospects such as Boina, Damali, and Danab, which are located in remote areas, most of the
prospects have existing transmission lines and substations within 30 km from the site. In
comparison with the construction cost of the geothermal plant, the estimated cost of transmission
line is so small that it is not necessary to adjust the prioritization order.
Table 5.2.10 Required Length and Voltage of Transmission Line
Source: JICA Project Team
iii) Accessibility to the Sites
Similar to the accessibility to the national grid, required access road to the site is measured after
Exsting TL(kV)
Connected Sub-stationVoltage
(kV)TL
(km)Cost
(mil $)1 Dallol 132 Wukro 132 90 23.42 Tendaho-3 (AllaloBeda) 230 Semera 230 15 5.63 Boina 230 Alamata 230 90 33.34 Damali 230 Semera 230 84 31.15 Teo 230 Semera 230 68 25.26 Danab 230 Semera 230 81 30.07 Meteka 66 Amibara 66 95 13.88 Arabi 230 Jijiga 230 65 24.19 Dofan 66 Amibara 66 7 1.010 Kone 132 Metehara 132 27 7.011 Nazareth 132 Nazareth 132 8 2.112 Gedemsa 230 Koka 230 12 4.413 Tulu Moye 132 Assela 132 30 7.814 Aluto-2 (Finkilo) 132 Adami Tulu 132 10 2.615 Aluto-3 (Bobesa) 132 Adami Tulu 132 13 3.416 Abaya 132 Sodo 400 35 19.317 Fantale 132 Metehara 132 8 2.118 Boseti 132 Nazareth 132 33 8.619 Corbetti 132 Shashamene 132 22 5.720 Aluto-1 (Langano) 132 Adami Tulu 132 14 3.621 Tendaho-1(Dubti) 230 Semera 230 11 4.122 Tendaho-2 (Ayrobera) 230 Semera 230 15 5.6
Geothermal Sites
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site survey in this study, as shown in Table 5.2.11. Taking into consideration the topography along
the access road as well as for security measures, cost of civil works for the access road and
earthworks in the site is estimated as preparatory work in the construction cost mentioned above.
Because the poor accessibility reflects the generation cost, prospects located in remote areas such
as Damali and Danab are evaluated low in the rank order of the generation cost.
Table 5.2.11 Required Length and Topography of Access Road
Source: JICA Project Team
5.2.2 Prioritization of the Geothermal Prospects
To sum up the prioritization of geothermal prospects using multi-criteria analysis mentioned above,
the prioritization order is summarized as shown in Table 5.2.12.
Accessibility TopographyRequired Access
Road (km)Cost
(mil $)1 Dallol Accessible Rolling 7 3.52 Tendaho-3 (Allalobeda) Good Plane 12 6.03 Boina Inaccessible Mountainous 40 40.04 Damali Difficult Rolling 81 64.55 Teo Difficult Mountainous 12 12.06 Danab Difficult Rolling 80 64.27 Meteka Good Plane 3 1.38 Arabi Difficult Rolling 35 28.09 Dofan Difficult Rolling 35 28.010 Kone Good Plane 4 2.111 Nazareth Good Plane 2 0.812 Gedemsa Accessible Plane 19 9.413 Tulu Moye Accessible Rolling 12 6.014 Aluto-2 (Finkilo) Good Plane 1 0.515 Aluto-3 (Bobesa) Good Rolling 2 1.016 Abaya Good Plane 30 15.017 Fantale Accessible Rolling 16 7.818 Boseti Good Rolling 9 4.619 Corbetti Good Rolling 10 5.120 Aluto-1 (Langano) Good Plane 0 0.021 Tendaho-1(Dubti) Good Plane 10 4.922 Tendaho-2 (Ayrobera) Good Plane 7 3.3
Geothermal Sites
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Table 5.2.12 Prioritization Order of the Geothermal Prospects
Source: JICA Project Team
Priority S: Committed Sites
Four projects, the 25 MW Tendaho-3 (Allalobeda), Corbetti, Aluto 1 (Aluto-Langano), and the 10 MW
shallow reservoir Tendaho-1 (Dubti), which were already committed by several donors, are prioritized
over other sites and are expected to go forward on their schedule.
Priority-A: Very High Economy
Five prospects, the Tendaho-1 (Dubti), Aluto-2 (Finkilo), Aluto-3 (Bobesa), Tendaho-2 (Ayrobera),
and Tendaho-3 (Allalobeda), which are assumed to have high temperature geothermal reservoirs and
an estimated generation cost of US$0.05-0.06/kWh, are evaluated as next highest priority. Aluto and
Tendaho in Priority-A is the most promising and can be prioritized over some of the candidate
hydropower projects.
Since Tendaho-1 (Dubti) and Tendaho-3 (Allalobeda) have preceded the project above, an expansion
project will be planned to develop the remaining geothermal potential in those sites. Several donors
have also planned and conducted geophysical sounding and drilling surveys in those Priority-A sites.
In this study, the JICA Project Team conducted magnetotelluric (MT) survey in Tendaho-2 (Ayrobera).
RankingOrder
Geothermal SiteInstalled Capacity
(MW)
Priority-S: Committed Project COD Donor
S Tendaho-3 (Allalobeda ) 25 2017 WBS Corbetti 500 2018 RGS Aluto-1 (Langano) 70 2018 Japan/WB
S Tendaho-1 (Dubti)-Shallow reservoir 10 2018 AFD
Priority-A: Very High Economy Energy Cost (US$/kWh)
1 Tendaho-1 (Dubti)-Deep reservoir 280 0.0572 Deep reservoir
2 Aluto-2 (Finkilo) 110 0.05853 Aluto-3 (Bobesa) 50 0.05924 Tendaho-2 (Ayrobera) 180 0.05935 Tendaho-3 (Allalobeda) 95 0.0621 Expantion
Priority-B: High Economy Energy Cost (US$/kWh)
6 Abaya 790 0.0717 RG has license7 Boseti 265 0.07218 Meteka 130 0.0731
Priority-C: Low Economy Energy Cost (US$/kWh)
9 Tulu Moye 156 0.1037 RG has license10 Teo 9 0.104011 Damali 92 0.108412 Nazareth 13.2 0.109113 Boina 40 0.111114 Dofan 86 0.0783 Conflict with residents15 Dallol 44 0.1076 Difficult due to low pH
Priority-D: Less Feasible Energy Cost (US$/kWh)
16 Danab 11 0.1700 Poor access17 Arabi 2.8 0.1872 Poor accessD Gedemsa 37 - Low temperatureD Kone 14 - Low temperatureD Fantale 48 - Overlapped with national park
Remarks
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Priority-B: High Economy
Three prospects, i.e., Abaya, Boseti, and Meteka, which are assumed to have 210-260 °C reservoir
temperature and an estimated generation cost of US$0.07-0.08/kWh, are categorized as Priority-B.
Priority-B has less economic value than Priority-A geothermal prospects and some competitive
hydropower plants, but is still more competitive than other renewable energy and thermal power
plants.
Abaya has already been licensed by RG. However, development action has yet to be done so far. In
addition to Tendaho-2 (Ayrobera), the JICA Project Team conducted MT/transient electromagnetic
(TEM) survey in Boseti prospect in this study and the result is explained in the next chapter. In Meteka,
no geophysical or drilling survey has been done as of this moment.
Priority-C: Low Economy
Following Priority-B, prospects with US$0.10-0.11/kWh generation cost such as Tulu Moye, Teo,
Damali, Nazareth, Boina and Dallol are ranked Priority-C. Dofan’s estimated generation cost is
US$0.0783/kWh and does not have any serious adverse social impact. However, there is a potential
conflict with local people. This is the reason why it is ranked lower in the group. Geothermal fluid in
Dallol is highly acidic that geothermal power development is expected to be difficult because the
materials and pipes that will be used should be resistant to strong acid corrosion. This is the reason
why Dallol is ranked at the bottom of the group as well.
Priority-D: Less Feasible
Danab and Arabi, which are estimated to have more than US$0.17/kWh of generation cost are
categorized as Priority-D. Their geothermal potentials are low and accessibilities to those sites are also
poor, resulting in very high generation costs.
Kone and Gedemsa are assumed to have very low reservoir temperature in the range of 130-170 °C as
mentioned above. Because only binary-type generation system, which is generally much more
expensive than flash-type generation system, can be applicable for those two prospects, they are given
the lowest priority.
As mentioned above, since Fantale overlaps the boundary of Awash National Park, the prospect is
ranked at the bottom of all prospects.
Those prospects evaluated as Priority-D are unfortunately less feasible. If social, environmental, and
technical issues are solved in some way in the future, they will become feasible projects.
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5.3 Implementation Plan
5.3.1 General Consideration
Development process of geothermal power plant before the start of generation consists of nine stages
as shown in Table 5.3.1: preliminary survey, exploration, appraisal drilling and well testing,
environmental impact assessment, well/power plant design, well drilling, power station construction
and start-up and commissioning.
In the preliminary survey like this study, data collection and surface reconnaissance are carried out and
selection of location for exploration stage for MT/TEM survey and geochemical analysis are
implemented. Based on these results, appraisal drilling and well testing, followed by simulation
analysis, are conducted in order to estimate geothermal potential. From the studies above, the scale
and depth of geothermal resources are assumed and size of power plant and its feasibility are discussed
from the point of view of economy in the feasibility study. At the same time, the environmental impact
assessment (EIA) is conducted. After approval of EIA, well drilling of production and reinjection well
and power station construction are started based on the detailed well/power plant design. Construction
of transmission line connecting to the geothermal power plant is basically the responsibility of EEP.
Table 5.3.1 Simplified Geothermal Development Period
Source: JICA Project Team
The preliminary survey was carried out for all prospects and geophysical survey (MT/TEM survey)
was done in Tendaho-2 (Ayrobera) and Boseti prospects. In Aluto and Tendaho area, MT/TEM survey
and exploration well were already carried out while Aluto-l (Aluto-Langano) has started geothermal
power generation. Thus, taking into consideration the development status, which allows omitting the
preliminary survey and exploration, development plans for each prospect with respect to the fastest
case are discussed in the next section based on the model case above.
5.3.2 Development Plan
Table 5.3.2 shows overall schedule of geothermal power development taking into account the fastest
case discussed in previous section. In the short-term, a total 610 MW of geothermal power plants
committed by several donors is developed. In the medium-term, the geothermal prospects of
1 Preliminary SurveyData collection, Site reconnaissance, Inventory survey, Site selection
2 ExplorationGeological/Geophisical/ Geochemical survey,Sounding (MT/TEM, Seismic), Pre-feasibility study
3 Appraisal Drilling & Well TestingSlim hole, Appraisal well, Well testing, Stimulation,Reservoir simulation
4 Feasibility Study Feasibility study
5 EIA
6 Well/Power Plant Design Well design, Power plant deisgn
7 Well Drilling Production/Reinjection wells
8 Power Station Construction Power plant, Steam gathering system
9 Start-up & Comissioning
Stageyear
1 2 3 4 5 6Tasks
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Priority-A and -B are aimed to be developed. As mentioned in section 5.2.1, those geothermal power
plants above are more economical than wind and solar power. From the point of view of the least-cost
power generation, a total 1,200 MW of wind farms and solar power generation plan in EEP master
plan should be delayed, and geothermal development should be advanced instead. Therefore, adding to
1,200 MW of the target installed capacity in medium-term, an accumulated total installed capacity in
the medium-term is 2,400 MW. In the long-term, other prospects are expected to be developed.
Table 5.3.2 Overall Schedule of Geothermal Power Development
Source: JICA Project Team
Short-term (2014–2018)
The development plan of Aluto-1 (Aluto-Langano), Tendaho-1 (Dubti), and Tendaho-3 (Allalobeda),
which were committed by several donors, and Corbetti, which was licensed by RG, are summarized as
shown in Table 5.3.3 below. From 2015 to 2018, a total output of 610 MW from the geothermal power
plants will be developed in the short-term in this master plan. Those geothermal development projects
are not reflected in the EEP master plan shown in Table 2.3.1. Therefore, it is necessary to revise the
development plan in the short- and medium-term based on those projects. The committed geothermal
power plants and large-scale hydropower plants under construction, such as the grand renaissance dam,
are expected to generate much more electricity than the forecasted electricity demand in the short-term.
Therefore, it is considered important to delay development of other electricity sources planned in EEP
master plan. However, overall development process of some geothermal projects may be delayed due
to the interruption of appraisal drilling. The Ethiopian government should monitor the development
process carefully and move ahead with the development plan to meet its reviewed schedule.
14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37
◎
◎
◎
◎
◎
◎
◎
◎
◎
Lisenced by RG ◎
Lisenced by RG ◎
◎
◎
◎
◎
◎
◎
◎
◎
◎
◎
◎
◎
◎
◎
◎: Commencement of Operation
15
16
17
-
-
-
10
9
12
11
13
14
5
-
6
7
8
S
-
1
2
3
4
Short-term Medium-term Long-term
S
S
S
2018
-
-
total
-
3701
Sub-total
2400 -
691 -
-
0.1047
2036
-
-
0.0726
0.1019
0.1643
0.1907
0.0731
0.0971
0.0974
0.1017
0.1017
Sub-total
Sub-total -
-
-
0.0572
0.0585
0.0717
0.0592
0.0609
0.0624
0.0585
0.0720
2036
2027
2027
2029
2029
2029
2030
2030
2036
2036
44
11
7
37
14 2036
-
120
9
390
33
230
100
86
2024
110
50
180
95
500
790
265
130
2021
2021
2021
2022
2024
2024
RankingOrder
Cost ofGeneration(US$/kWh)
25 2017
500
Kone
Fantale
Year of 20**
CODInstalledCapacity
(MW)Prospect
75 2018
10 2018
Boina
Dofan
Dallol
Danab
Arabi
Gedemsa
Boseti
Meteka
Teo
Tulumoya
Nazareth
Damali
Aluto-3
Tendaho-2
Tendaho-3
Corbetti
Abaya
Tendaho-3
Corbetti
Aluto-1
Tendaho-1
Tendaho-1
Aluto-2
25 610 610
280 2020
2020
610 610 610 610 610 610 610 610 610 610 610 610 610 610 610 610 610 610 610
25 610 610 1000 1325 1825 3902 39021825 3010 3010 3010 3409 3409
2400 2400
3772 3902 3902 3902
2400 2400 2400 2400 2400 2400
3902 4091 4091
390 715 1215 1215 2400
892 892
2400 2400 2400 2400
892 1081 1081
2400
399 399 762 892 892 892
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Table 5.3.3 Short-term Development Plan
Source: JICA Project Team (Development plan were referred to published documents of several donors)
Medium-term (2019–2025)
According to economic evaluation, the Priority-A and -B prospects are more economical than other
power generation schemes such as wind farms and solar power. Therefore, their development should
be prioritized over other power generation schemes in terms of least-cost power generation plan. EEP
master plan has an expected total of 1,200 MW from wind farms and solar power generation which are
not specified projects in the short-term up to 2018. The JICA Project Team would like to propose that
wind farms and solar power generation projects that are not specified should be delayed and
construction of geothermal power plants, which are mainly planned in the long-term, should be moved
forward instead.
Table 5.3.4 presents the geothermal development plan in the medium-term. Priority-A prospects are
aimed to be developed by the year 2020 or 2021. Among the Priority-A prospects, Aluto and Tendaho
area has some initial development activities such as geophysical exploration and drilling survey in the
short-term and there are planned exploration by several donors, such as deep well drilling in
Tendaho-1 (Dubti) funded by the Agence Française de Développement (AFD), MT survey in Aluto-2
(Finkilo), Aluto 3 (Bobesa), and Tendaho-3 (Allalobeda) by the World Bank (WB) and Icelandic
International Development Agency (ICEIDA). Utilizing the results of those activities to shorten the
process of Aluto and Tendaho projects, it is possible to start their operation by 2020 to 2021 at the
earliest. Boseti and Meteka prospects of Priority-B are planned to start operations in 2025 which is the
final year of the medium-term. Since there is sufficient preparation time for those prospects, GSE is
expected to carry out detailed exploration to evaluate the possible geothermal resource amount and to
plan for a drilling survey at an earlier time.
Rank SiteInstalledCapacity
(MW)COD
ICEAE/NFD/WBStart-up & Comissioning
RGStart-up & Comissioning
WB/GoJStart-up & Comissioning
AFDStart-up & Comissioning
SAluto-1 (Langano)
75 2018
500
Development by Donors
Corbetti
2014 2015 2016 2017 2018
2018
STendaho-1 (Dubti)
10 2018
STendaho-3 (AllaloBeda)
25 2017
S
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Table 5.3.4 Middle-term Development Plan
Source: JICA Project Team
Rank SiteInstalledCapacity
(MW)COD
GSE (ELC) 2013 Preliminary SurveyAFD Exploration (MT survey)
AFD Appraisal drilling (Two Full size well)Feasibility Study/EIA Financial dicision on the 100MW project at the beginning of 2016
Well/Power Plant DesignWell Drilling
Power Station ConstructionStart-up & Comissioning
JICA Preliminary SurveyICEADA/NDF Exploration (MT Survey)
Appraisal Drilling & Well TestingFeasibility Study/EIA
Well/Power Plant DesignWell Drilling
Power Station ConstructionStart-up & Comissioning
JICA Preliminary SurveyICEADA/NDF Exploration (MT Survey)
Appraisal Drilling & Well TestingFeasibility Study/EIAWell/Power Plant Design
Well DrillingPower Station Construction
Start-up & ComissioningJICA Preliminary Survey
JICA Exploration (MT Survey, etc.) (JICA) Appraisal Drilling & Well Testing (Slim hole/Full size well)
Feasibility Study/EIAWell/Power Plant Design
Well DrillingPower Station Construction
Start-up & ComissioningICEADA/NDF
ICEADA/NDF Exploration (MT survey)ICEAD/NDF/WB Appraisal Drilling & Well Testing (25MW Development)
Feasibility Study/EIAWell/Power Plant Design
Well DrillingPower Station Construction
Start-up & ComissioningDevelopment by RG
Start-up & ComissioningDevelopment by RG
Start-up & ComissioningJICA Preliminary Survey
JICA Exploration (MT Survey, etc.) Appraisal Drilling & Well Testing
Feasibility Study/EIAWell/Power Plant Design
Well DrillingPower Station ConstructionStart-up & Comissioning
JICA Preliminary SurveyExploration
Appraisal Drilling & Well TestingFeasibility Study/EIAWell/Power Plant Design
Well DrillingPower Station ConstructionStart-up & Comissioning
2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
B Abaya 790 2024
2014
ATendaho-3 (Allalobeda)
95 2021
A Corbetti 500 2022
ATendaho-2 (Ayrobera)
180 2021
AAluto-3 (Bobesa)
50 2021
Tendaho-1 (Dubti)
280 2020
AAluto-2 (Finkilo)
110 2020
2025
B Boseti 265 2024
B Meteka 130 2024
A
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Long-term (2026–2037)
Since most of the hydropower potential in Ethiopia is expected to be developed in the long-term and
electricity demand is forecasted to exceed 20,000 MW in the early 2030s, more geothermal potential is
anticipated to be developed. In this master plan, all geothermal potential is planned to be developed by
2037 as shown in Table 5.3.5.
In this study, characteristics and temperature of geothermal reservoir is evaluated by brief surface
reconnaissance and geochemical analysis and by analysis of existing data in some prospects where the
site survey is impossible for security and access reason. In order to clarify the scale and temperature of
the geothermal reservoir in more detail to discuss their feasibility, it is necessary to carry out the
detailed exploration.
Table 5.3.5 Long-term Development Plan
Source: JICA Project Team
5.4 Financial Considerations for Geothermal Development
This section discusses financing aspect based on several funds. Due to its lack of own funds, the
government cannot help but resort to external funds for geothermal development. The JICA Project
Team sees four possible sources of funds: Word Bank ODA loans, Japan's ODA loan, commercial
banks loans and bonds issue. Their financing conditions (interest rates and repayment periods) are
summarized in Table 5.4.1. In this calculation the capital costs are annualized using the interest rate
and the repayment period of each fund. This is in contrast with calculation of economic costs of
generation in Section 5.2.1 in which the capital costs are annualized using a discount rate of 10% and
an economic period of 30 years. Then the financial costs of generation thus calculated (hereafter called
'cost of production') are compared with the tariffs to see which funds are financially feasible. The
tariffs might include transmission and distribution costs, but due to their smallness against generation
costs and simplicity, the costs of generation are directly compared with the tariffs.
At present, the generation cost by dominant geothermal power plant in Ethiopia is estimated around
US$0.05-0.06/kWh. On the other hand, the Ethiopian power market is receiving a large amount of
subsidy to suppress the selling price of domestic electricity to about US$0.015-0.04/kWh, average
US$0.03/kWh. And electricity has been exported at about US$0.07/kWh to neighboring countries such
as Djibouti, based on the PPA between the countries. Figure 5.4.1 shows the comparison with capital
Rank SiteInstalledCapacity
(MW)COD
C Teo 9 2027 9 9 9 9 9 9 9 9 9 9 9C Tulu Moye 390 2027 ## ## ## ## ## ## ## ## ## ## ##C Nazareth 33 2029 33 33 33 33 33 33 33 33 33C Damali 230 2029 ## ## ## ## ## ## ## ## ##C Boina 100 2029 ## ## ## ## ## ## ## ## ##C Dofan 86 2030 86 86 86 86 86 86 86 86C Dallol 44 2030 44 44 44 44 44 44 44 44
D Danab 11 2036 11 11
D Arabi 7 2036 7 7D Gedemsa 37 2036 37 37D Kone 14 2036 14 14D Fantale 120 2036 ## ##
2026 2027 2028 2029 2030 20372031 2032 2033 2034 2035 2036
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costs of each condition and existing power price (consumer price). It is assumed that the existing
subsidy would be maintained.
Even the Priority-A geothermal prospects, which is estimated to have the lowest capital cost of
US$0.0301/kWh in the case of yen-loan by the Government of Japan (GoJ), has a slightly higher
selling price of domestic electricity. On the other hand, the Priority-A and -B prospects are below the
export price of US$0.07/kWh in the case of official development assistance (ODA) by WB and GoJ.
In the case of loans by commercial banks and bonds, all prospects are over US$0.07/kWh. Thus, the
project cost for geothermal development needs to be financed by WB or GoJ loan, or equivalent
condition.
Table 5.4.1 Possible Funds Loan Conditions
Item ODA-WB ODA-GOJ Commercial Banks Bonds
Interest (%) 5.0 3.0 6.0 5.0
Repayment period (year) 20 30 10 7
Source: IDA
Source: JICA Project Team (Fund procurement condition is referred to IDA)
Figure 5.4.1 Tariff and Production Cost using Several Funds
0.0000
0.0500
0.1000
0.1500
0.2000
0.2500
0.3000
0.3500
Tendaho-1(D
ubti)
Aluto-2 (Finkilo)
Corbetti
Aluto-3 (B
obesa)
Tendaho-2
(Ayrobera)
Tendaho-3
(Allalobeda)
Aluto- 1 (L
angano)
Abaya
Boseti
Meteka
Dofan
Teo
Tulu M
oye
Fantale
Nazareth
Dam
ali
Dallol
Boina
Danab
Arabi
Tar
iff
(US
$/kW
h)
Production Costusing ODA-WB
Production Cost using Commercial
Production Cost using Bonds
Production Cost using ODA-GOJ
Domestic Tariff:2.8 cents/kWh
Export Tariff:7.0 cents/kWh
Priority -APriority -B
Priority -C
Priority -D
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5.5 Implementation Structure
5.5.1 Consideration of Structural Body for Geothermal Energy Development
(1) Energy cost and Structural Body
As stated in Chapter 5.4 above, the energy cost in Ethiopia ranges from US$ 0.07-0.08/kWh, whereas
the retail electricity price ranges from US$ 0.015-0.04/kWh (average US$ 0.03/kWh). The GoE
presently subsidizes this gap. For export, the price is set at US$ 0.07/kWh according to the PPA with
Djibouti. Thus, the energy cost of geothermal power generation shall be below the presently adopted
electricity retail tariffs under the conditions of the present energy price policy.
IFC conducted a case study where four value chain models for geothermal power generation were
assumed, and presented a tariff variation for each case. Tariffs here are defined as the sales tariffs
charged for the electricity generated by the geothermal power plant at the delivery point to off-takers
(Figure 5.5.1). For the four cases, it was assumed that the private sector will construct and conduct
operation and maintenance (O&M) of the power plant, except for the case of the fully public model.
For the US$ 0.15/kWh tariff level, a full private model (except for pre-survey) may be used,
For the US$ 0.12-13/kWh levels, the private sector may enter at the test drilling stage,
For the US$ 0.10/kWh level, private entry after the test drilling stage may be possible,
For the US$ 0.05/kWh level, all the upstream activities should be undertaken by the government,
leaving the power plant construction and operation to the private sector, and
For the US$ 0.03/kWh level, only the fully public model may be used.
With the current tariff levels, possible and sustainable options are a fully public model for the
domestic supply project, and Models C or D for the export supply project. However, it will be a
reasonable option wherein geothermal power plants will be used for domestic use rather than
hydropower, which is susceptible to seasonal fluctuations. Therefore, fully public model may be the
best option for geothermal energy development.
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Figure 5.5.1 PPP Model Options and Tariff
(2) Pros/Cons Analysis of GSE and EEP and Proposal of New Organization
The Business Models C or D and fully public model will only be sustainable under the present
national electricity price policy. Under these models, public entities shall conduct work up to at least
the test well drilling stage. Presently, GSE and EEP are the only public entities that could undertake
the mandate. The IFC (International Finance Cooperation) of a World Bank Group presented a
pros/cons analysis of these entities. The analysis also assumes a new entity. A summary of the analysis
is as follows:
1) Pros/Cons Analysis of GSE and EEP
Pros/cons analysis for surface survey and test drilling are as follows:
The existing GSE has legal mandate to undertake geotechnical investigation and exploration
activities. The GSE geothermal directorate is especially dedicated to geothermal development.
They have limited experience and/or insufficient resources in terms of manpower and equipment.
The existing EEP is presently involved in Aluto and Tendaho projects. They have no legal mandate
for geothermal development. The commercially operating EEP might be unmatched with high risk
exploration works.
A new, special purpose entity (presently non-existing) with mandate to focus on geothermal
resources may address all the shortcomings of the two existing entities and accelerate rapid
geothermal development, although it requires new laws and regulations that may take time to set
up.
Pros/cons analysis for field development:
The existing GSE has test drilling experience although manpower and financial capabilities are
limited.
The existing EEP is willing to do field development in Aluto-Langano and may be able to raise
funding easily, although they do not have sufficient manpower, equipment, and technical
Plantconstruction
Fielddevelopment
F/S &planning
Testdrilling
Exploration
PreliminarySurvey
Operation
Field Plant
Public Private
Public Private
Public Private
Public Private
Public
Public Private
(Source) IFC
Tariff($/kWh) Remarks
0.15
0.13
0.10
0.05
0.03
Corebetti
Tendaho
AlutoLangano
A
B
C
D
FullPublic
Busi
ness
Mod
el
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experience.
A new, special entity (presently non-existing) may rapidly accelerate geothermal development.
2) Restrictions of Existing Organizations and Proposal of New Special Purpose Entity
Figure 5.5.2 summarizes various options of models C, D, and fully public model. Figure 5.5.2 includes
the case where one unified entity undertakes production and sale of steam as well as power generation
because there are similar cases all over the world including GDC in neighboring Kenya. Examples
were explained in the latter part of this section as reference. On the other hand, a fully private model
such as the one that is being operated in Corbetti is not included because the overall business model is
not clearly announced at this stage.
An analysis is described below in accordance with Figure 5.5.2.
Since the existing GSE is responsible only for geoscientific research activities, GSE may not
undertake production well construction and the work thereafter. Therefore, an amendment of the
existing laws and/or regulations shall be necessary for Option D-1 and Option FPc-1. Similarly,
since the existing EEP is responsible for generation, transmission, and distribution of electricity,
they may not undertake geoscientific survey in Option D-3 and Option FPc-3 without amendment
of existing laws and/or regulations. However, even if the relevant laws and/or regulations were to
be amended, the following issues shall be addressed.
Even though it is not necessary to get a mandate from the Ministry of Water, Irrigation and Energy,
EEP is undertaking confirmation well drilling in Aluto-Langano. This corresponds to Models D-2
or FPc-2. In the Project, the actual drilling works are conducted by GSE in the field under the
project manager from EEP. Possibly due to insufficient EEP experience in geothermal development
management, the project tended to be behind schedule. Therefore, it is indispensable that EEP
capacity shall be enhanced for geothermal development if these options are to proceed.
However, such capacity enhancement will result in competing or duplicating mandate against GSE
under the Ministry of Mines. Therefore, coordination or cooperation will be indispensable between
the two public entities. That being said, however, coordination/cooperation of two entities, each
under different ministries, will usually be difficult. Thus, it is recommended that
geothermal-related sections of those two entities shall be merged into one public entity.
Such new entity shall be formed under the Ministry of Water, Irrigation and Energy because the
main purpose of geothermal development is for electricity development. There will be two options:
the first option is to merge them under EEP and the other is to establish a new entity outside EEP.
The first option may not be suitable because: (i) EEP is presently undertaking large-scale
hydropower projects so vigorously that geothermal development priority will be kept low, and (ii)
the commercially operating EEP might be unmatched with high risk exploration works, which may
render management complicated. All of these may hinder smooth development of geothermal
energy.
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From the above analysis, it is recommended to establish a new special purpose entity that
undertakes geothermal energy development-related services, under the Ministry of Water,
Irrigation and Energy.
Source: JICA Project Team
Figure 5.5.2 PPP Models for Geothermal Development in Ethiopia
5.5.2 Special Purpose Public Entity (Enterprise)
(1) Establishment of Special Purpose Public Entity (Enterprise)
The recommended new special purpose entity is temporarily named as Ethiopian Enterprise for
Geothermal Energy Development (EEGeD). The business models of EEGeD are the Models D-4, FPc-4,
and FPc-5. EEGeD could deal with the Model C-1 and C-2, if the private sector will undertake the
operation from the start of field development. As can be seen from the figure, the mandates of EEGeD
may be as follows:
To undertake the geothermal resource surface survey and test drilling,
To undertake project feasibility study when necessary for future business of EEGeD,
To undertake field development wherever possible, and
Middle Off-taker
PreliminarySurvey
ExplorationTest
DrillingF/S,
PlanningField
DevelopmentPower PlantConstruction
Operation EEP
FPc-5
GSE EEPSteam: EEP
Power Plant: PrivateEEP
EEP
EEP
EEP
EEP
EEP
EEP
EEP
EEP
-
Power Plant: PrivateGSE GSE(*)
Steam: GSE(*)
C2Power Plant: EEP
-Steam: Private
GSE GSE(*)Power Plant: EEP
Steam: GSE(*)
D1
D2
D3
New EnterpriseSteam: New E.
D4Power Plant: Private
EEP(*) EEPSteam: EEP
Power Plant: Private
Power Plant: Private
(*) GES is not in charge of Fielddevelopment and/or Steam sales
FullyPublicModel
New EnterprisePower Plant: New
Steam: New E.
FPc-1
Notes
(*) GES is not in charge of Fielddevelopment and/or Steam sales
-
(*) EEP is not in charge of exploration
-
C1
Early Late
Development Stage
BusinessModel-D
BusinessModel-C
-Steam: Private
EEP
GSE EEP
EEP(*) EEP
EEP
Power Plant: EEPSteam: EEP
Power Plant: EEPSteam: EEP
Private
Private
GSE (or New Enterprise)
GSE (or New Enterprise)
D1, D3, FPc1, FRc2
D2, FPc3
D4, FPc-4, FPc-5
C1, C2 In Model C1 and C2, the New Enterprize may handle the work upto Test Drilling
In Model-D, FPc-4 and FPc-5, the New Enterprize will undertake steam prodution and sales.
EEP Capacity for geothermal development shall be enhanced, GSE and EEP shall be well coordinated (D2, FPc-2)
Amendment of regulations for GSE and EEP is required (D1, D3, FPc-1, FPc-3)
FPc-2 Present Aluto Langano Project
(*) EEP is not in charge of exploration.
-
FPc-3
FPc-4 New EnterprisePower Plant: EEP
Steam: New E.
GSE
GSE
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To operate steam production and sales wherever possible.
However, the current move to privatization will likely become more evident in the future with various
financial and/or regulation arrangements. Therefore, the establishment of EEGeD shall not hinder the
private sector from participating in geothermal development at any stage.
There may be a possibility that EEGeD may extend its operation to power generation. However, it may
be prudent that the mandate of EEGeD should be concentrated to geothermal-related matters since even
this mandate necessitates highly specialized knowledge and experience.
The merits of forming EEGeD are as follows:
EEGeD will be able to concentrate its efforts to geothermal development mainly for the purpose of
electricity generation;
EEGeD will also be able to accumulate its knowledge and experiences within the organization,
which will accelerate geothermal development; and
EEGeD, as the single focal point for geothermal development in Ethiopia, will be able to attract
donors’ attention, which will make financial arrangement much easier.
(2) Establishment of EEGeD
The new geothermal-specialized public entity EEGeD shall be financially sustainable once it becomes
a fully-fledged operation. It is for this reason that EEGeD shall undertake steam production and sales,
thereby ensuring stable revenue. It is understood that a public entity in Ethiopia named “Enterprise” is
defined to be financially sustainable.
Designing of a proper institutional and regulation framework and formulation of implementation plan
of the new enterprise EEGeD will be necessary. A master plan project will be proposed in Chapter 9 in
this report.
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5.6 On Direct Use of Geothermal Resources
5.6.1 Present Status of Geothermal Resource
(1) Direct Uses of Geothermal Resources in the World and in Japan
Table 5.6.1 shows the present status of direct uses of geothermal resources in the world and in Japan
Geothermal resources are widely used for bathing/pools, indoor heating, and greenhouses in the world
whereas there are only nominal uses for others. On the other hand, it is used in Japan largely for
bathing – Onsen bathing followed by snow melting.
Table 5.6.1 Present Status of Geothermal Direct Uses in the World and in Japan
Geothermal Direct Uses World (15,346 MW) Japan (2,100 MW) Bathing/swimming pool 44% 87%
Heating 35% 4% Greenhouses 10% 2% Fish farming 4% 0%
Industrial utilization 4% 0% Space cooling/snow melting 2% 7%
Agricultural drying 1% 0%
Source: Lund et al. (2010)
(2) Direct Uses of Geothermal Resources in Ethiopia
In Ethiopia, geothermal resources are used by local people mainly for hot spring or steam bathing. In
Sodole, there is are large-scale state operating recreational facilities; and hot spring bathing facilities
are available in Addis Ababa and in the southern part of Ethiopia. In Nazareth (Boku), there is a state
operating sanitarium facility, and there are local steam bathing locations in the surveyed area.
Table 5.6.2 Geothermal Direst Use
Sites Direct User
1 Gedemsa (Hippo Pool)
There are bathing facilities that draw water from nearby hot springs. Local residents use them for hot spring curing and washing as well.
2 Nazareth (Boku) There are small rooms above the fumaroles for vapor bathing and cure. There is a state operating accommodation. The whole area is prepared as recreation area or sanitarium facility.
3 Nazareth (Sodole) The whole area, including hot springs, is utilized as a recreation center and tourist attraction, where swimming pool and bathing facilities are equipped with restaurants and accommodations.
4 Boseti (Kintano) The fumaroles are covered by rock fences. They are utilized as steam baths.
5 Meteka There are bathing facilities utilizing nearby hot springs. Local residents use them for hot spring curing.
6 Bobessa (Gebiba) People gather water by covering the fumarole with tree branches for cooling the vapor into water.
Source: JICA Project Team
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Gedemsa (Hippo Pool) Nazareth (Boku)
Nazareth (Sodole) Boseti (Kintano)
Meteka Aluto-2 (Bobessa: Gebiba)
Source: JICA Project Team
Figure 5.6.1 Geothermal Resource Direct Use in Ethiopia
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5.6.2 Proposals for Direct Uses of Geothermal Resources in Ethiopia
(1) Lindal Diagram
The general application guidelines for direct uses of geothermal resources are systematized as Lindal
Diagram (Jon S. Gudmundsson, etc., 1985). Hot spring not hotter than the body temperature is used
for fish farming and swimming pools. Temperatures between the body temperature and 100 ℃ are
used for space heating including greenhouse and drying of agricultural products and stock fish. Vapor
above 100 ℃ can be used for various applications such as drying of industrial products like cement
and agricultural products like sugarcanes.
Source:Jon S. Gudmundsson, others (1985)
Figure 5.6.2 Lindal Diagram
(2) Proposal of Direct Use in Ethiopia
The following table shows the proposals for direct uses of geothermal resources in Ethiopia based on
the consideration of the existing geothermal site conditions and the current utilization of geothermal
resources.
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Table 5.6.3 Proposals for Direct Uses of Geothermal Resources in Ethiopia
Direct uses items
Contents Conditions Areas
Gardening Greenhouses
Greenhouse flower growing (export)
Suitable water available (effect: constant temperature, sterilization, photosynthesis)
Ziway lake (Aluto-Langano, Tulu Moye)
Fish farming Farming of prawns and fresh water fish (export)
Suitable water available
Ziway Lake (Aluto-Langano, Tulu Moye)
Agriculture Fruits growing (export) Vegetable growing (domestic)
Suitable water available Near large market
Ziway Lake (Aluto-Langano, Tulu Moye)
Nazareth
Leisure and recreation
Hot spa, pool, steam bath Easily accessible Geothermal site
Food processing Dry fruits Close to fruit production area Geothermal sites in Oromia, Southern Nation
Yogurt Close to milk production area Near large market
Nazareth Boseti
Coffee beans drying Close to coffee plantation Geothermal sites
Sugarcane drying Close to sugarcane plantation Geothermal site Tendaho
Source: JICA Project Team
In addition, cascade utilization will be applicable if the geothermal source is sufficiently hot.
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5.7 [REFERENCE] Models of Geothermal Power Development in International Practice
5.7.1 International Practice
Figure 5.7.1 (R.1) shows models of geothermal power development in international practice. In many
cases, public financing is applied up to field development stage. After confirmation of geothermal
resources, private firms participate in the value chain. However, the following characteristics are
commonly observed in countries where private firms have participated in the chain (ESMAP 2012).
Open market has successfully been implemented in power generation businesses other than geothermal power generation. Parts of or all power generation businesses have been privatized.
Country investment risks are commonly evaluated low and sufficient returns can be ensured.
Central government of local governments promote private investment.
In general, the countries in this group are mostly middle- and high-income countries or countries with
well-understood geothermal resources and established track record in developing them.
Figure 5.7.1 (R.1) Models of Geothermal Power Development in International Practice
5.7.2 Example of Kenya
Since 2006, segregation of power generating sector has been implemented into various specialized
organizations for achieving efficient operations in Kenya. Power generation is being conducted by
1 2 3 4 5
PreliminarySurvey
SurfaceExploration
Test Drilling,F/S
FieldDevelopment
Power PlantConstruction
Middle Stage
1Kenya(KenGen at Olkaria),Costa Rica (ICE), etc
2 Indonesia (before), New Zealand, Ethiopia (Aluto Langano) etc
2'Private
ContractorMexico (OPF model)
3 Iceland (before the crisis)
4 El Salvador (LaGeo + Enel Green Power), Japan(recent)
5 Japan (before)
5' NPC Philippines BOT model;
6 US; new IPP Project in Turkey, New Zealand, Guatemala and others
7US, Nicaragua and recently Chile; Public entities perform limited exploration. IPPs sharethe risks of further exploration and construction
8New Philippines (Chevron project), Australia and Italy (Enel Green Power), NewIndonesia with Geothermal Fund Facility, Ethiopia (Corbetti), Japan (recent)
(Original Source: ESMAP 2012, modified by JICA Team)
Private Developers
O&M
Public entities
Late Stage
Public entity (PNOC EDC) Private Developer
Private Developers(power generation)
Public entities (GDC in Kenya, Purutamina in Indonesia)
Public entities(Steam production)
Private DevelopersPublic entities
ICE: Instituto Costarricense de Electricidad, Costa Rica; CFE: Federal Commission for Energy, Mexico; PNOC EDC: Philippines National Oil Co.,-Energy Development Corporation, Philippines;NPC: National Power Corporation, Philippines; GDC: Geothermal Development Company, Kenya;
Early Stage
Private Developers
6
A Fully integrated single national public entity
Multi national public entities(Early stage by one entity and subsequent stage by other/s for an example)
Public entity (CFE) CFE
National and municipal public entities
Fully integrated JV partially owned by the government
Kenya (KenGen+GDC), Indonesia (before), Philippines (before)
Private Developers
Note
5"
Public entities
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Kenya Electricity Generating Company (KenGen)that owns 72% of installed capacity (as of 2012)
and other IPPs whereas the off-taker is Kenya Power and Lighting Company (KPLC). As for
geothermal development, the Geothermal Development Company (GDC) was established in 2008 as a
governmental special purpose vehicle that undertakes exploration and steam production as well. GDC
was separated from KenGen and was given the mandate to undertake the specialized but high-risk task
of geothermal development, whereas KenGen should concentrate its effort on power generation only
so that the electric sector itself could be more efficient.
GDC has been designed so that it gains revenue through steam production and sales. Figure 5.7.2 (R.2)
shows the general operational model of GDC. Option K-1 of GDC corresponds to the Business
Models D-4 and/or FPc-4; Option K-3 corresponds to the Business Model C-1 and/or C-2. At present,
field development is being undertaken in Menengai Geothermal Field of Kenya with Options K-1 and
K-2. It is understood GDC has already entered steam supply agreement with three IPPs (Quantum
Power East Africa, Orpower Twenty Two, and Socian Energy) and scheduled to commence steam
supply by the end of 2015.
Figure 5.7.2 (R.2) Operation Option of GDC, Kenya
5.7.3 Example of Geothermal Development in the Philippines
Geothermal development in the Philippines dates back to 1967 when small-scale geothermal power
stations were constructed in Barrio Cale, Tiwi, and Albay. Full-fledged development was implemented
in Tiwi and Makban (660 MW, 1979-1984) in Luzon, which the National Power Corporation (NPC)
constructed through the then Philippine Geothermal Incorporated. Since then, geothermal power
K-1 K-3 K-4 K-5
POWERGENERATION
PRODUCTIONDRILLING AND
POWER
STEAMDEVELOPMENT
AND
FULLCONCESSION
DETAILED SURFACESTUDIESINFRASTRUCTUREDEVELOPMENT
EXPLORATION DRILLING
APPRAISAL DRILLING
FEASIBILITY STUDY
PRODUCTION DRILLING
STEAM GATHERING
POWER PLANTCONSTRUCTIONOPERATION ANDMAINTENANCE
STEAM FIELD MANAGEMENT
(Source: GDC 2014, slightly modified by the JICA Project Team)
In operation at Menengai
GDC: Geothermal Development Company; IPP: Independent Power Provider
Optional
IPP
GDC PUBLIC PRIVATE PARTNERSHIP - OPTIONS
K-2
IPP
IPP
IPP INPUT
DEVELOPMENT STAGE
GDC
GDC
IPP
GDC
IPP
IPP
VIA
BIL
ITY
AN
AL
YS
ISIM
PL
EM
EN
TA
TI
INC
OM
E
JOINT STEAMDEVELOPMENT
GDC
GDC
GDC
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stations were constructed mainly by the Philippine National Oil Company–Energy Development
Corporation (PNOC-EDC), i.e., Palinpinon I (112.5 MW, 1983), Tongonan (112.5 MW, 1983),
Bacon-Manito (150 MW, 1994), and Palinpinon II (80 MW, 1992). In principle, PNOC–EDC
undertook the development from initial surface survey to steam production and sales whereas NPC
undertook power generation, except a few cases where PNOC–EDC also generated electricity.
In 2001, “The Electric Power Industry Reform Act” was enacted, whereby NPC was then privatized,
followed by the step-by-step privatization of PNOC–EDC from 2006. As a result, all the geothermal
power stations including Tiwi-Makban, were sold to private firms. However, the separate operational
model, i.e., steam production and sales business and power generation business have been maintained
in many geothermal power stations. The last power stations developed by the government-owned
PNOC–EDC was Mindanao II (54 MW, 1999) and Northern Negros (49.4 MW, 2007). At the former
power station, the privatized EDC continues to supply steam to a build-operate-transfer (BOT) power
generation company, and the latter has been closed down due to insufficient geothermal resource.
After privatization, there have been no particular geothermal development activities for a long time
until 2014, when the Maibarara Geothermal Power Station (20 MW) in Luzon was put into operation.
A power station (40 MW) in Mindoro is also reported to be operational in 20153.
In conclusion, PNOC-EDC, before privatization, had largely contributed to the geothermal
development in the Philippines.
Hereunder, the operation mode of PNOC–EDC and NPC before privatization is introduced, since
business circumstances in Ethiopia may be similar to that of the Philippines when geothermal power
stations were constructed4.
3 Newspaper of IEE JPAN, 5th December, 2014
4 Danilo C. Catigtig (2008), Geothermal Energy Development in the Philippines with the energy development corporation embarking into
power generation, UNU-GTP 30th Anniversary Workshop
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Source: Danilo C. Catigtig 2008
Figure 5.7.3 (R.3) Operation Mode of PNOC EDC in the Philippines
The operation mode in the Philippines is explained by Danilo C. Catigtig (2008) as follows:
The company’s steam field and power plant operations are based on a framework that covers four
types of contracts, from which its financial position is practically hinged:
Geothermal Service Contracts (GSC) with the Department of Energy (DOE) - give EDC the right
to explore, develop, and utilize geothermal resources in a certain contract area and in turn remits
to the government taxes and royalties from the net proceeds;
Steam Sales Agreements (SSA) with NPC - EDC delivers and sells steam to NPC power plants
for conversion to electricity with a minimum take or pay provision;
Power Purchase Agreements (PPA) with NPC - EDC sells to NPC electricity with a minimum
energy off-take level provision;
Energy Conversion Agreements (ECA) with BOT contractors - EDC delivers steam to the BOT
power plant and pays the contractor for the conversion of steam to electricity at a nominated
capacity; and
Energy Sales Agreement with cooperatives and DU’s - EDC sells electricity from its own
merchant plant.
5.7.4 Example - Indonesia
Geothermal development in Indonesia has been developed in accordance with Presidential Decree 45
(PD-45, 1991) in principle, followed by various amendments of laws/regulations. Geothermal power
generation is being conducted in ten sites out of 58 geothermal areas designated by the Ministry of
Energy and Mines, as of 2014. All major sites, except for a remote island, were initiated under the Nippon Koei Co., Ltd.JMC Geothermal Engineering Co., Ltd Sumiko Resources Exploration & Development Co., Ltd.
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framework enacted by the decree. PD-45 (1991) is illustrated in the figure below:
1. PERTAMINA and its joint operations contractors to develop and operate the steam field only, selling the steam to PLN or other parties for electricity.
2. PERTAMINA or its contractors to generate electricity as well as develop and operate the steam field, with the electricity produced sold to either PLN or other consumers.
Source: JICA Project Team
Figure 5.7.4 (R.4) Geothermal Development Model before Privatization in Indonesia
The principal characteristic of the operations model is that steam development is undertaken by
PERTAMINA or a contractor who entered into a Joint Operation Contract (JOC) with PERTAMINA.
Although PERTAMINA was privatized in 2003, the presently operating geothermal power stations in
Indonesia were initiated by the then nationally-owned PERTAMINA through resource confirmation.
This is obvious in Table 5.7.1 (R.1), which shows that steam production of all the power plants that are
presently operational or to be operational are PERTAMINA-related companies except for two small
power stations in the remote island of Flores. In other words, no private firms other than
PERTAMINA-related firms have participated in test wells and steam development.
In 2011, the Government of Indonesia set up the Geothermal Fund Facility to attract private
investment for test well drilling activities. By 2013, geothermal survey license for 32 prospects was
given to developers. However, no report has reached the JICA Project Team if any test well has been
drilled in any of the 32 geothermal prospects.
From the above, it is obvious that the nationally-owned PERTAMINA played a very important role in
the development of geothermal energy in Indonesia.
GoI Pertmina
Contractor
PLN
ESC
JOC
Exploration,Field development and Steam production, or plus power
Steam supply, or plus power supply
Steam supply, or plus
Power supply, or plus Power generation
Pertmina
PLN
ESC
Exploration,Field development andSteam production; or plus power
Steam supply, or plus power supply
Power supply, or plusPower generation
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Table 5.7.1 (R.1) Geothermal Power Stations Operational in Indonesia (as of 2015)
No. Name Province Capacity (MW)
DOC Steam Production
Power Generation
JOC/ESC
1 Kw. Kamojang, West Java 30 1983
PT. PGE PLN JOC, ESC 55x2 1988 60 2008 PT. PGE (PPA)
2 Kw. Darajat West Java 55 1994 PT. Chevron PLN JOC, ESC 90 2000 PT. Chevron JOC, ESC 110 2007 PT. Chevron (PPA)
3 G. Wayang
Windu West Java
110 2000 PT. Star Energy JOC, ESC 117 2009 PT. Star Energy (PPA)
4 G. Salak West Java 60x3 1994
PT. Chevron JOC, ESC 65 1997
5 G. Dieng Central Java 60 1999 PT. Geodipa JOC, ESC
6 G. Sibayak North Sumatra 2 1996 PT. PGE ESC 5 2007
PT. PGE (PPA) 6 2007
7 Sarulla North Sumatra (330MW) (2016) Consortium JOC, ESC
8 Kw. Ulubelu Lampung 55x2 2012 PT.PGE PLN ESC 55 (2016)
PT.PGE PLN (PPA) 55 (2017)
9 Kw. Lahendon North Sulawesi 20 2001 PT. PGE PLN ESC 20 2007
PT. PGE PLN (PPA) 20 2009
10 Kw. Ulumbu West Flores 5 2014 PT. PLN - 11 Kw. Mataloko Central Flores 1.8 2011 PT. PLN -
Source: Based on Asnawir Nasutionm and Endro Supriyanto (2011), edited by the JICA Project Team with information of “Geothermal Power Generation in the World 2010-2014 Update Report” (Ruggero Bertani 2015) and others. Shaded: after privatization of PERTAMINA; DOC: Date of Commencement
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CHAPTER 6 GEOPHYSICAL SURVEY
6.1 Objectives
The Project Team conducted geophysical survey at two selected sites in order to provide information
for selecting test well targets.
6.2 Selection of the Target Sites
Two sites for the geophysical survey were selected from the 22 targets sites based on the following
criteria. Through the Master Plan formulation in the Chapter 5, Tendaho-2 (Ayrobera), Boseti and
Meteka were selected as high priority sites to be developed other than those sites that have been
already committed by other donors or a private firm. Among those, we selected Tendaho-2 (Ayrobera)
and Boseti for the geophysical survey. We expect GSE to conduct the survey in Meteka using
equipment newly provided by JICA for the survey.
6.3 Selection of the Target Sites
The geophysical survey conducted consisted of MT (Magnetotelluric) survey and TEM (Transient
Electromagnetics) survey.
・Survey Method
MT method with far remote reference site
TEM method with central loop system(for static correction of MT data)
・Survey Site
Tendaho-2 (Ayrobera) site and Boseti site
・The number of stations
Tendaho-2 (Ayrobera) site: 24 stations, Remote reference station at Mille
Boseti site: 30 stations, Remote reference station at Koka
・Acquired data
MT method: 3 components of magnetic field 3 (Hx, Hy, Hz) and 2 components of electric
field (Ex, Ey) in time series data (Measurement time: More than 14 hours per one station)
TEM method: 1 component of magnetic field (Hz) of transient response
・The number of frequency for data processing and analysis
MT method: 80 frequencies in the range of 320Hz ~ 0.00034Hz
TEM method: 3 kinds of repeat rate 237.5Hz, 62.5Hz and 25.0Hz
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6.4 Survey Results
The location map and the station map of the MT/TEM survey for each survey area are shown in Figure
6.4.1, Figure 6.4.2, and Figure 6.4.3. The list of coordinates of the stations is shown in Appendix-6.
6.4.1 Tendaho-2 (Ayrobera) Geothermal Field
(1) MT Survey
After the acquired data were processed using the remote reference technique, the apparent resistivity
and phase curves were created, and the data quality of each measuring station evaluated. At almost all
stations, the data quality from high frequencies to low frequencies was good. Though at some stations
the apparent resistivity curve shows a little scattering in local reference data processing, noises were
reduced and data quality was improved after remote reference data processing.
After 2D inversion analysis was carried out at eight profiles, as shown in Figure 6.4.2, which consist
of two profiles where the MT survey was conducted in the Project and the six existing profiles from
past MT surveys, the resistivity structure was obtained and the resistivity cross sections were created.
According to the results, the resistivity plan maps and the corresponding panel diagram were created.
Figure 6.4.4 shows the panel diagram of the resistivity plan maps. The resistivity cross sections, the
resistivity plan maps, and the fit of the observed data and model responses are attached in Appendix-6.
The main resistivity features of Tendaho-2 (Ayrobera) as revealed from the MT survey are as follows:
About the surveyed site, the resistivity structure is generally composed of three zones, namely,
conductive overburden, resistive zone, and conductive zone, from the surface to 5,000 m depth.
The resistivity distribution is roughly in the range of 1 ohm-m to 250 ohm-m.
At 200 m elevation, low resistivity (≤ 16 ohm-m) is widely spread all over the surveyed site.
Moreover, very low resistivity (≤ 3 ohm-m) is widely prevalent at the southwest part and
southeast part.
At 0 m elevation, low resistivity is widely spread all over the site, similar to that at 200 m
elevation and the resistivity value becomes lower. Resistivity at the southern part is relatively low.
At -700 m elevation, a low resistivity (≤ 16 ohm-m) belt is at the center of the site. Especially at
the center of the belt, the resistivity is lower at less than 6 ohm-m. High resistivity of more than
40 ohm-m can be found outside the conductive belt and high resistivity variation is exhibited
around the border of the conductive belt. The almost straight contour lines indicate resistivity
discontinuity structure.
At -1,500 m elevation, the conductive belt of NW-SE strike direction is recognized similar to that
at -700 m elevation. Comparing with -700 m elevation, the distribution pattern is similar and the Nippon Koei Co., Ltd. JMC Geothermal Engineering Co., Ltd Sumiko Resources Exploration & Development Co., Ltd.
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resistivity values are entirely higher.
At -2,500 m elevation, similar to that at -700 m and -1,500 m elevations, the conductive belt of
NW-SE strike direction is recognized at the center of the site. The difference from that at -1,500
m elevation is that the resistivity value of the conductive belt is more than 40 ohm-m.
The width of the conductive belt which is distributed from -700 m elevation to the deep zone does
not change generally and the conductive belt composes a channel structure of low resistivity to
the deep zone. That channel structure of low resistivity is rather narrow in width and shows a little
constriction around profile TDO97.
The NE-SW strike direction is clearly recognized from the shallow zone to the deep zone except
for surface ground in each resistivity plan map.
(2) Summary
The characteristics of the resistivity structure in the surveyed site are summarized in Table 6.4.1.
Table 6.4.1 Summary of MT/TEM Survey at Tendaho-2 (Ayrobera) Item Descriptions
Resistivity Structure Composed of three zones, namely, conductive overburden, resistive zone and conductive zone, from the surface to -5,000 m elevation.
Resistivity Value Ranges from 1 ohm-m to 250 ohm-m
Resistivity Discontinuity
The conductive belt of NW-SE direction is distributed from -700 m elevation to the deep zone and composes the channel structure of low resistivity at the center of the site. The resistivity discontinuity structure is indicated by the resistivity variation between the channel structure composed of the distribution of low resistivity and high resistivity. The channel structure of low resistivity is rather narrow around the profile of TDO97. This suggests resistivity discontinuity across the channel structure.
Source: JICA Project Team
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6.4.2 Boseti Geothermal Field
(1) MT Survey
After the acquired data were processed using the remote reference technique, the apparent resistivity
and phase curves were created and the data quality of each measuring station evaluated. At almost all
stations, the data quality from high frequencies to low frequencies was good. At BST-501, the acquired
data had high scatter in low frequencies and the curve slopes are too large on its apparent resistivity
curve, indicating the existence of artificial electromagnetic noise. It seems to be the effect of the power
lines at the northern part outside the survey site. Data quality of the other stations is fairly good after
noise reduction using remote reference data processing.
After 2D inversion analysis was carried out at four profiles, as shown in Figure 6.4.3, the resistivity
structure was obtained and the resistivity cross sections were created. As described below, offset
values of static correction obtained from the results of the TEM survey were applied to the MT
observed data as input data in the 2D inversion analysis of resistivity structure. Based on the analysis
results, the resistivity plan maps and the panel diagram of the resistivity plan map were created. Figure
6.4.5 shows the panel diagram of the resistivity plan map. The resistivity cross sections, the resistivity
plan maps and the fit of the observed data and model responses are given at the end of the report.
The main resistivity features of the Boseti site revealed from the MT survey are as follows:
Generally, the resistivity structure is composed of three zones, namely, resistive overburden,
conductive zone, and resistive zone, from the surface to 3,000 m depth. The resistivity
distribution is roughly in the range of 1 ohm-m to 600 ohm-m.
From the surface to 50 m depth, high resistivity (≥ 63 ohm-m) is widely spread all over the survey
site. Especially at the northwest part and south part, higher resistivity (≥ 250 ohm-m) is observed.
At 1,200 m elevation, low resistivity is widely distributed at the south part and the location of its
spread coincides with the highlands at the northern slope of Mt. Berecha. The border between the
distribution of low resistivity and that of high resistivity at the northern side shows high contrast
of resistivity variation, and its contour lines are straight in the WNW-ESE direction and indicate
resistivity discontinuity.
At 500 m elevation, low resistivity is widely spread all over the site. In particular, a low resistivity
belt in the NNE-SSW direction can be found at the central part and shows less than 4 ohm-m.
From the central part to the north side, the lowest resistivity (≤ 3 ohm-m) is observed. The
distribution of low resistivity of the south part at 1,200 m elevation can be seen at this elevation
which means there is continuous distribution of low resistivity to the deeper zone.
At 0 m elevation, the conductive belt is shown similar to that at 500 m elevation, but the value of
resistivity is a little higher. The area outside the conductive belt shows high resistivity and high Nippon Koei Co., Ltd. JMC Geothermal Engineering Co., Ltd Sumiko Resources Exploration & Development Co., Ltd.
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contrast of resistivity variation is shown around the border of the conductive belt. That contrast
indicates resistivity discontinuity structure. The low resistivity distribution observed at 1,200 m
elevation cannot be observed at this elevation.
At -500 m elevation, high resistivity (≥ 25 ohm-m) is widely spread all over the site, and
compared with 0 m elevation, relatively high resistivity is observed. More than 63 ohm-m
resistivity is distributed locally. The conductive belt can be seen but its resistivity value is higher.
At -1,000 m elevation, the distribution pattern of resistivity is similar to that of -500 m elevation.
Relatively high resistivity (≥ 25 ohm-m) can be found all over the site and the conductive belt in
the NNE-SSW direction observed from 500 m elevation to -500 m elevation can be recognized
slightly.
The NNE-SSW strike direction is mainly recognized from the shallow zone to the deep zone in
each resistivity plan map.
(2) TEM Survey
The TEM survey was conducted at all stations of MT measurement. About the acquired data quality,
though data scatters were observed in a few windows of earlier time and later time at several stations,
better quality data applicable to 1D inversion analysis was acquired completely. 1D inversion analysis
of resistivity layer was executed using the observed data at each station. Layered resistivity structures,
which show resistivity variation of high-low-high from the surface to the deep zone, were obtained at
almost all stations. From the results of such, MT responses were calculated and the apparent resistivity
and phase curves were created and the offset values for static correction were estimated. After
applying the offset values to the apparent resistivity curves observed by MT method, 2D inversion
analysis of resistivity structure was executed. The list of offset values for static correction and the
results of 1D inversion analysis of resistivity layer are at the end of the report.
(3) Summary
The summarized characteristics of the resistivity structure in the survey site are shown in Table 6.4.1.
Table 6.4.1 Summary of MT/TEM Survey at Boseti
Item Descriptions
Resistivity Structure Composed of three zones, namely, conductive overburden, resistive zone, and conductive zone, from the surface to -3,000 m elevation.
Resistivity Value Ranges from 1 ohm-m to 60 ohm-m
Resistivity Discontinuity
The conductive belt of NNE-SSW direction continues from 500 m elevation to the deep zone and composes the channel structure of low resistivity at the center of the site. The resistivity discontinuity structure is observed from the resistivity variation between the channel structure composed of the distribution of low resistivity and high resistivity. The low resistivity zone found under the highlands at the northern slope of Mt. Berecha continues from the shallow zone to the deep zone. The resistivity discontinuity is observed at 1,200 m elevation, where the high WNW-ESE contrast is shown between low and high resistivity at the northern part of the survey site.
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Source: JICA Project Team
6.4.3 Notes for Reservoir Modelling
Generally, the geological structure is deduced from the resistivity distribution obtained by data
analysis in the electromagnetic survey. By knowing the underground resistivity distribution, geology
and geological structure, physicality, existence of groundwater, hot spring, and argillation zone,
alteration zone can be inferred.
Considering the geothermal reservoirs in volcanic areas, an impermeable zone over the geothermal
reservoir is formed by the low resistivity zone regarded as clay minerals and a relatively resistive zone
under the impermeable zone is expected as geothermal reservoir. In the resistive zone, there exists a
variation of resistivity and generally, a fracture zone has high permeability so that existence of fluid in
the fracture zone causes relatively low resistivity. Considering the above, what the resistivity structure
of each survey site indicates were inferred.
(1) Tendaho-2 (Ayrobera) Geothermal Field
Considering the characteristics of the resistivity structure obtained from the results of this MT survey
and the existing geological information, and the results of the past MT survey, the shallow zone of low
resistivity is inferred to be of sediments including saline fluid or hydrothermal alteration zone and the
medium zone of high resistivity is inferred to be mainly of basaltic lava rocks. Low resistivity in the
deep zone may suggest the existence of fluids related to geothermal resource. Based on the
characteristics of the resistivity structure in the survey site, there are channel structures of low
resistivity in the NW-SE strike direction and the resistivity discontinuity across the channel structure
which shows narrow width around the TDO97 profile. These resistivity discontinuities may be
inferred having the possibility to dominate the geothermal reservoir model.
(2) Boseti Geothermal Field
Considering the characteristics of the resistivity structure obtained from the results of this MT survey
and the existing geological information, the shallow zone of high resistivity is inferred to be of
volcanic lava rocks and the medium zone of low resistivity is inferred to be of hydrothermal alteration
zone or aquifer including saline fluid. The deep zone of high resistivity is inferred to be of tuffs. Based
on the characteristics of the resistivity structure in the survey site, there are channel structures of
NNE-SSW strike direction which show low resistivity and are seen from 500 m elevation, and the
distribution of low resistivity which is seen from the shallow zone and continues to the deep zone.
These resistivity structures may be inferred having the possibility to dominate the geothermal reservoir
model.
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Source: JICA Project Team
Figure 6.4.1 Location map of MT survey
Legend □: Survey site for MT method ◎: Reference station □: Geothermal site
Reference station for Ayrobera site
Reference station for Boseti site
点
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Legend TDH-101 ● : MT station
Existing stations and acquisition year ●: 2011 ●: 2012 ●: 2013
Source: JICA Project Team
Figure 6.4.2 The location map of MT stations (Ayrobera)
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Legend BST-501 ● : MT station
Mt. Berecha
Source: JICA Project Team
Figure 6.4.3 The location map of MT stations (Boseti)
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Source: JICA Project Team
Figure 6.4.4 The panel diagram of resistivity plan maps (Ayrobera)
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Source: JICA Project Team
Figure 6.4.5 Panel Diagram of Resistivity Maps (Boseti)
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6.5 Interpretation of Resistivity Structure in Geothermal Sites
Underground resistivity structure of a geothermal field is usually divided into three (3) zones (or
layers), Characteristics of the three zones in relation with hydrothermal alteration and temperature are
shown in Figure 6.5.1 and Table 6.5.1.
Table 6.5.1 General Interpretation of Resistivity Structurein relation with Alteration Mineral Occurrence and Temperature
Name of Zone Range of ValueInterpretation of Reservoir
Temperature Alteration/Geology
1) Resistive overburden
Up to several hundred ohm-m or some thousands ohm-m
50-100 oC<Non-Alteration Zone>Volcanic ash, alluvium, fresh volcanic rocks,etc.
2) Low resistivity zone
Lower than 5 to 10ohm-m
100-250 oC
<Argillized (clay) zone (as cap rock)>Clay minerals such as smectite and interstratified clay minerals containing smectite layers associated with zeolites
3) Resistive zone
Up to several tens ohm-m to some hundreds ohm-m
250-300 oC<Chlorite –Epidote Zone (as a reservoir)>High-temperature condition such as chlorite, illite, epidote (and garnet), etc.
Source: JICA Project Team, referred by METI et al. (2010)
a. Alteration mineralogy and temperature b. Relationship between alteration zone and resistivity
Source: Gylfi et al. (2012)
Figure 6.5.1 General Interpretation of Resistivity Structure in relation with Alteration Minerals
Occurrence and Temperature
6.5.1 Tendaho-2 (Ayrobera) Site
Figure 6.5.2 shows the resistivity distribution maps at different elevations, EL+200 m, EL+0 m,
EL-700 m, EL-1,500 m, and EL-2,500 m.
In this diagram, low resistivity zones (less than 10 ohm-m) are remarkably dominant at EL 200 m and
EL 0 m level; a low resistivity zone extending NW-SE direction becomes apparent at El.-700 m level
and downward though the distinctiveness tends to fade out downward. The zone of NW-SE direction
that is well in accordance to the general trend of the Tendaho Graben, is considered to be an intensely
Thermal alteration starts
Thermal alteration prominent
Smectite Zeolites Dominant
Chlorite Epidote Dominant
Smectite Zeolites disappear
S-Ch Mixed layered clay
Chlorite
50 ºC
100 ºC
200 ºC
230 ºC
250 ºC
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fractured zone, delineated higher resistive zones (intact rock zones) on both side of the west and the
east. The fractured zone could be a reservoir because high permeability would be expected.
For interpreting the cross sectional model, existing information are available here in Tendaho. In
Tendaho-1 (Dubti), about 13 km south-east from the site, six (6) test wells were drilled from 1994 to
1998. Among those, TD-1 and TD-2 are useful to refer. The relevant information of the two wells was
summarized in Table 6.5.2. According to the table, the depth of the measured resistivity 5 ohm-m
ranges from 530 m to 580 m; whereas the depth of the measured temperature 245 – 250 oC ranges
from 450 m to 600 m. From this well corresponding relation between the depths of the resistivity and
the temperature, the depth of 5 ohm-m may be considered as the bottom of the cap layer or the top of
the reservoir in Tendaho area.
Table 6.5.2 Existing Test Well Data in Tendaho-1 (Dubti)
Name of Zone
TD-1 TD-2
Resistivity, (Measured
depth)
Temperature, (Measured
depth)
Alteration, Inferred Temp.,
(Measured depth)
Resistivity, (Measured
depth)
Temperature, (Measured
depth)
Alteration, Inferred Temp.,
(Measured depth) 1) Resistive
over burden
Resistive <150 ºC Non-alteration
50-100 ºC , (95 m)
Resistive <150 ºC Non-alteration ,5
0-100 ºC, (50 m)
2) Low resistive zone
<5 ohm-m, (580 m)
150 - 250 ºC, (600 m)
Argillized , 100-250 ºC,
(350 m) <5 ohm-m
(530 m) 150 º- 245 ºC
(450 m)
Argillized , 100-250 ºC,
(280 m)
3) High resistive zone
>5 ohm-m 250 ºC Chlorite-Epidote,
250-300 ºC >5 ohm-m 245 ºC
Chlorite-Epidote, 250-300 ºC
Source: Aquator (1994) and Aquator (1995), Compiled by JICA Project Team
Figure 6.5.3 shows E-W cross section of the resistivity. In the Figure 6.5.3, it is apparent that a zone of
low resistivity goes down at the middle part of the analysis section. This low resistivity zone was
interpreted as a fault fracture zones that runs NW-SE direction, and the fault zone may be the reservoir.
From the Figure 6.5.3, it is apparent that the reservoir is capped by a low resistivity layer, and
delineated by high resistivity zones on both sides. As the layer with resistivity lower that 5 ohm-m was
interpreted as cap layer (“cap rock”), the bottom depth of the cap layer is estimated to range from 300
m to 1,200 m on the top of the inferred reservoir. Table 6.5.3 summarized the interpretation of the
reservoir structure.
It is noted that the fumaroles observed on the surface are not located on the top of the inferred
reservoir. This may be interpreted such a way that the top of the reservoir part has been completely
sealed by alteration clay and the fumaroles found the pass at a rim part where a set of manor faults
outcrops on the surface.
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Table 6.5.3 Interpretation of MT/TEM Survey Results with Alteration Mineral Occurrence and Temperature in Tendaho-2 (Ayrobera)
Zone Interpretation of Reservoir
Resistivity Depth (GL-m) Interpretation of Temperature 1) Resistive
overburden >10 ohm-m Less than 100 m 50-100 oC
2) Low resistivity zone
Less than 5 ohm-m Approximately
100–500 m 100-250 oC
3) High resistive zone
>5 ohm-m (40–60 ohm-m)
Deeper than 300– 1,200 m
250-300 oC
Source: JICA Project Team
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Figure 6.5.2 Schematic Panel Diagram of Resistivity Distribution and Interpretation in Tendaho-2 (Ayrobera)
Basaltic Volcanic rocks and Alluvial Sediments with salt accumulation on ground
Argillized Zone (less than 5ohm-m, more than 100 oC)
Argillized
Chl-Ep
ArgillizedChl-Ep
Chl-Ep
Chl-Ep
Transition Zone between Argillized to Chrolite-Epidote Zone (boundary: 5ohm-m, Approx 250 oC)
Chl-Ep Zone(Reservoir: between 40-60 ohm-m, More than 250 oC)
Fa-2Fa-1(Surface Elevation 375m)
(GL-175m)
(GL-375m)
(GL-1075m)
(GL-1875m)
(GL-2875m)
Chl-Ep Zone(Reservoir: between 40-60 ohm-m, More than 250 oC)
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Figure 6.5.3 Schematic Section of Tendaho-2 (Ayrobera)
6.5.2 Boseti Geothermal Site
Figure 6.5.4 shows the resistivity distribution maps at different elevations, EL+1,250 m, EL+1,200 m,
EL+50m, EL+0 m, EL-500 m and EL-1,000 m.
In this diagram, resistivity higher than 100 ohm-m observed at surface level is interpreted as a new
lava layer. The lower resistivity zones less than 5 ohm-m are remarkably dominant at EL 500 m level:
a low resistivity zone extending N-S direction becomes apparent at EL 0 m level and downward
though the distinctiveness tends to fade out downwards. The zone is well in accordance to the faults
extending to NNE-SSW direction. The low resistivity zone therefore may be interpreted as a fault zone
delineated on the both sides by resistive zones.
Figure 6.5.5 shows the WNW-ESE cross section of the resistivity. In Figure 6.5.5, it is apparent that a
wide zone (channel) of lower resistivity goes down. The low resistivity zone was interpreted in this
figure as a fault zone running NNE-SSW direction. It is apparent that the reservoir is capped by a low
resistivity layer, and delineated by higher resistivity zones on both side. Therefore, the low resistivity
zone could be interpreted as a geothermal reservoir. It was interpreted in Tendaho that the layer of
resistivity lower that 5 ohm-m would be a cap layer (cap rock), the bottom depth of the cap layer is
estimated to range fromGL- 800 m to GL-900 m as shown in Figure 6.5.5. Table 6.5.4 summarized the
interpretation of the inferred reservoir.
Herein Boseti also, the fumaroles observed on the surface are located on a rim part of the inferred
reservoir, where a fault was identified.
250 oC
FumaroleArea
Fa-2Fa-1
Argillized
Chl-Ep
SW NE
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Table 6.5.4 Interpretation of MT/TEM Survey Results with Alteration Mineral Occurrence and Temperature in Boseti
Zone Interpretation of Reservoir
Resistivity Depth (GL-m) Interpretation of
Temperature 1) Resistive
overburden 10–150 ohm-m Less than 300–500 m 50-100 oC
2) Low resistivity zone
Less than 5 ohm-m Approximately
500–900 m 100-250 oC
3) High resistive zone
>5 ohm-m (25–40 ohm-m)
Deeper than 800– 900 m 250-300 oC
Source: JICA Project Team
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Figure 6.5.4 Schematic Panel Diagram of Resistivity Distribution and Interpretation in Boseti
(Surface Elevation 1300m)
(GL-100m)
(GL-800m)
(GL-1300m)
(GL-1800m)
(GL-2300m)
Lava and Volcanic Depositswith hydrothermal alteration
Top of Argillized Zone (under 5 ohm-m, approx. 100 oC)
Middle of ArgillizedZone
Transition Zone between Argillized to Chrolite-Epidote Zone (boundary: 5 ohm-m, Approx 250 oC)
Chl-Ep Alteration Zone (as Reservoir: between 25-40 ohm-m)
Chl-Ep Alteration Zone (as Reservoir: between 25-40 ohm-m)
Chl-Ep Chl-Ep
Chl-Ep
Argillized
Chl-Ep Chl-Ep
Fb-2Fb-1
Argillized
Argillized
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Figure 6.5.5 Schematic Section of Boseti Geothermal Site
Argillized
Chl-Ep
100 oC
250 oC
WNW ESE
Fb-2Fb-1
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